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  <h3>Concepts</h3>
  
  <ul>
!     <li>
!         <a href="https://man.openbsd.org/ipsec.4">ipsec(4)</a>:
!         Started by John Ioannidis, Angelos D. Keromytis, Niels Provos, and
!         Niklas Hallqvist, imported February 20, 1997.  OpenBSD was the first
!         free operating system to provide an IPSec stack.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/inet6.4">inet6(4)</a>:
!         First complete integration and adoption of IPv6 led by
!         "Itojun" (Dr. Junichiro Hagino) [WIDE/KAME], Craig Metz [NRL], and
!         Angelos D. Keromytis starting Jan 6, 1999.
!         Almost fully operational Jun 6, 1999 during the
!         <a href="hackathons.html">first OpenBSD hackathon</a>.
!         OpenBSD 2.7.
!     </li>
!     <li>
!         <strong>Privilege separation</strong>:
!         First implemented by
!         <a href="http://www.citi.umich.edu/u/provos/ssh/privsep.html">Niels Provos</a>
!         and Markus Friedl in OpenSSH in March 2002, released with OpenBSD 3.2.
!         The concept is now used in many OpenBSD programs, for example
!         <a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>,
!         <a href="https://man.openbsd.org/dhclient.8">dhclient(8)</a>,
!         <a href="https://man.openbsd.org/dhcpd.8">dhcpd(8)</a>,
!         <a href="https://man.openbsd.org/dvmrpd.8">dvmrpd(8)</a>,
!         <a href="https://man.openbsd.org/eigrpd.8">eigrpd(8)</a>,
!         <a href="https://man.openbsd.org/file.1">file(1)</a>,
!         <a href="https://man.openbsd.org/httpd.8">httpd(8)</a>,
!         <a href="https://man.openbsd.org/iked.8">iked(8)</a>,
!         <a href="https://man.openbsd.org/ldapd.8">ldapd(8)</a>,
!         <a href="https://man.openbsd.org/ldpd.8">ldpd(8)</a>,
!         <a href="https://man.openbsd.org/mountd.8">mountd(8)</a>,
!         <a href="https://man.openbsd.org/npppd.8">npppd(8)</a>,
!         <a href="https://man.openbsd.org/ntpd.8">ntpd(8)</a>,
!         <a href="https://man.openbsd.org/ospfd.8">ospfd(8)</a>,
!         <a href="https://man.openbsd.org/ospf6d.8">ospf6d(8)</a>,
!         <a href="https://man.openbsd.org/pflogd.8">pflogd(8)</a>,
!         <a href="https://man.openbsd.org/radiusd.8">radiusd(8)</a>,
!         <a href="https://man.openbsd.org/relayd.8">relayd(8)</a>,
!         <a href="https://man.openbsd.org/ripd.8">ripd(8)</a>,
!         <a href="https://man.openbsd.org/script.1">script(1)</a>,
!         <a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>,
!         <a href="https://man.openbsd.org/syslogd.8">syslogd(8)</a>,
!         <a href="https://man.openbsd.org/tcpdump.8">tcpdump(8)</a>,
!         <a href="https://man.openbsd.org/tmux.1">tmux(1)</a>,
!         <a href="https://man.openbsd.org/xconsole.1">xconsole(1)</a>,
!         <a href="https://man.openbsd.org/xdm.1">xdm(1)</a>,
!         <a href="https://man.openbsd.org/Xserver.1">Xserver(1)</a>,
!         <a href="https://man.openbsd.org/ypldap.8">ypldap(8)</a>,
!         <a href="https://man.openbsd.org/pkg_add.1">pkg_add(1)</a>,
!         etc.
!     </li>
!     <li>
!         <strong>Privilege revocation</strong>:
!         Related to the work on privilege separation, some programs were refactored
!         to drop privileges while holding onto a tricky resource such as a raw socket,
!         reserved port, or modification-locked bpf(4) descriptor,
!         for example
!         <a href="https://man.openbsd.org/ping.8">ping(8)</a>,
!         <a href="https://man.openbsd.org/traceroute.8">traceroute(8)</a>,
!         etc.
!     </li>
!     <li>
!         <strong>Stack protector</strong>:
!         Developed since 2001 as "propolice" by Hiroaki Etoh. Integrated, and
!         implemented for additional hardware platforms, by Miod Vallat and Theo
!         de Raadt.  OpenBSD 3.3 was the first operating system to enable it
!         systemwide by default.
!     </li>
!     <li>
!         <strong>W^X</strong>:
!         First used for sparc, sparc64, alpha, and hppa in OpenBSD 3.3.
!         Strictly enforced by default since OpenBSD 6.0: a program can only
!         violate it if the executable is marked with <code>PT_OPENBSD_WXNEEDED</code>
!         and it is located on a filesystem mounted with the <code>wxallowed</code>
!         <a href="https://man.openbsd.org/mount.8">mount(8)</a> option.
!     </li>
!     <li>
!         <strong>GOT and PLT protection</strong> by ld.so:
!         first done as part of the W^X work in OpenBSD 3.3, by Dale Rahn and
!         Theo de Raadt. The GOT and PLT regions are read-only outside of ld.so
!         itself. Extended to the .init/.fini sections (constructors and
!         destructors) in OpenBSD 3.4.
!     </li>
!     <li>
!         <strong>ASLR</strong>:
!         OpenBSD 3.4 was the first widely used operating system to
!         provide it by default.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/gcc-local.1">gcc-local(1)</a>
!         __attribute__((__bounded__)) static analysis annotation
!         and checking mechanism:
!         Started by Anil Madhavapeddy on June 26, 2003
!         and ported to GCC 4 by Nicholas Marriott.
!         First released with OpenBSD 3.4.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/malloc.3">malloc(3)</a>
!         randomization implemented by Thierry Deval. Guard pages and randomized (delayed) free added by Ted Unangst.
!         Reimplemented by <a href="papers/eurobsdcon2009/otto-malloc.pdf">Otto Moerbeek</a>
!         for OpenBSD 4.4.
!     </li>
!     <li>
!         <strong>Position-independent executables (PIE)</strong>:
!         OpenBSD 5.3 was the first widely used operating system to enable it
!         globally by default, on seven hardware platforms.
!         Implemented in November 2008 by
!         <a href="https://www.openbsd.org/papers/nycbsdcon08-pie/">Kurt Miller</a>
!         and enabled by default by
!         <a href="https://www.openbsd.org/papers/asiabsdcon2015-pie-slides.pdf">Pascal Stumpf</a>
!         in August 2012.
!     </li>
!     <li>
!         <strong>Random-data memory</strong>:
!         the ability to specify that a variable should be initialized
  	at load time with random byte values (placed into a new ELF
  	<b>.openbsd.randomdata</b> section) was implemented in
  	OpenBSD 5.3 by Matthew Dempsky.
!     </li>
      <li>
-         <strong>Stack protector per shared object</strong>:
-         using the random-data memory feature, each shared object was given its
-         own stack protector cookie in OpenBSD 5.3 by Matthew Dempsky.
-     </li>
-     <li>
-         <strong>Static-PIE</strong>:
-         Position-independent static binaries for /bin, /sbin and ramdisks.
-         Implemented for OpenBSD 5.7 by Kurt Miller and Mark Kettenis.
-     </li>
-     <li>
-         <strong>SROP</strong>
-         (<a href="https://man.openbsd.org/sigreturn.2">sigreturn(2)</a>
-         oriented programming) mitigation: attacks researched by
-         <a href="http://www.cs.vu.nl/~herbertb/papers/srop_sp14.pdf">Eric Bosman</a>
-         and Herbert Bos in 2014, solution implemented by Theo de Raadt in May 2016, 
-         enabled by default since OpenBSD 6.0.
-     </li>
-     <li>
-         <strong>Library order randomization</strong>:
-         In <a href="https://man.openbsd.org/rc.8">rc(8)</a>, re-link
-         <code>libc.so</code>, <code>libcrypto</code>, and <code>ld.so</code>
-         on startup, placing the objects in a random order.
-         Theo de Raadt and Robert Peichaer, May 2016,
-         enabled by default since OpenBSD 6.0 and 6.2.
-     </li>
-     <li>
-         Kernel-assisted lazy-binding for W^X safety in multi-threaded programs.
-         A new syscall <a href="https://man.openbsd.org/kbind.2">kbind(2)</a>
-         permits lazy-binding to be W^X safe in multi-threaded programs.
-         Implemented for OpenBSD 5.9 by Philip Guenther in July 2015.
-     </li>
-     <li>
-         Process layouts in memory tightened to remove execute permission from
-         all segmented, non-instruction data and to remove write permission from
-         data that is only modified during loading and relocation.
-         By combining the RELRO (Read-Only after Relocation) design from the
-         GNU project with the original ASLR work from OpenBSD 3.3 and
-         strict lazy-binding work from OpenBSD 5.9, this is applied to not
-         just a subset of programs and libraries but rather to all programs
-         and libraries.
-         Implemented for OpenBSD 6.1 by Philip Guenther in August 2016.
-     </li>
-     <li>
-         Use of <strong>fork+exec in privilege separated programs</strong>. The
-         strategy is to give each process a fresh &amp; unique address space for
-         ASLR, stack protector -- as protection against address space discovery attacks.
-         Implemented first by
-         Damien Miller (<a href="https://man.openbsd.org/sshd.8">sshd(8)</a> 2004),
-         Claudio Jeker (<a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>, 2015),
-         Eric Faurot (<a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>, 2016),
-         Rafael Zalamena (various, 2016), and others.
-     </li>
-     <li>
-         <strong>trapsleds</strong>:
-         Reduction of incidental NOP instructions/sequences in the instruction
-         stream which could be useful potentially for ROP attack methods to
-         innaccurately target gadgets. These NOP sequences are converted into
-         trap sequences where possible. Todd Mortimer and Theo de Raadt, June
-         2017.
-     </li>
-     <li>
-         <strong>Kernel relinking at boot</strong>: 
-         the .o files of the kernel are relinked in random order from a
-         link-kit, before every reboot. This provides substantial interior
-         randomization in the kernel's text and data segments for layout and
-         relative branches/calls.  Basically a unique address space for each
-         kernel boot, similar to the userland fork+exec model described above
-         but for the kernel.  Theo de Raadt, June 2017.
-     </li>
-     <li>
  	Rearranged i386/amd64 register allocator order in 
  	<a href="https://man.openbsd.org/clang.1">clang(1)</a>
  	to reduce polymorphic RET instructions:
  	Todd Mortimer, November 20, 2017.
-     </li>
      <li>
  	Reencoding of i386/amd64 instruction sequences to avoid
  	embedded polymorphic RET instructions.  Enhancements to
  	<a href="https://man.openbsd.org/clang.1">clang(1)</a>
  	Todd Mortimer, April 28, 2018 and onwards.
!     </li>
!     <li>
! 	<b>MAP_STACK</b> addition to 
  	<a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
  	allows opportunistic verification that the stack-register
  	points at stack memory, therefore catching pivots to non-stack
  	memory (sometimes used in ROP attacks).
  	Theo de Raadt, April 12, 2018.
!     </li>
!     <li>
!         <b>RETGUARD</b> is a replacement for the <b>stack-protector</b>
!         which uses a per-function random cookie (located in the read-only ELF
!         <b>.openbsd.randomdata</b> section) to consistency-check the
!         return address on the stack.  Implemented for AMD64 and ARM64
!         by Todd Mortimer in OpenBSD 6.4.
!     </li>
!     <li>
! 	<b>MAP_CONCEAL</b> addition to 
  	<a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
  	disallows memory pages to be written to core dumps, preventing
  	accidental exposure of private information.
  	Theo de Raadt, Mark Kettenis and Scott Soule Cheloha,
  	February 2, 2019.
-     </li>
  
  </ul>
  
  <h3>Functions</h3>
  
  <ul>
!     <li>
!         <a href="https://man.openbsd.org/issetugid.2">issetugid(2)</a>:
!         Theo de Raadt, August 25, 1996, OpenBSD 2.0
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/arc4random.3">arc4random(3)</a>:
!         David Mazieres, December 28, 1996, OpenBSD 2.1
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/bcrypt.3">bcrypt(3)</a>:
!         Implemented by <a href="https://www.usenix.org/legacy/events/usenix99/provos/provos_html/node1.html">Niels Provos and David Mazieres</a>
!         Imported February 13, 1997 and first released with OpenBSD 2.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/strlcpy.3">strlcpy(3)</a>,
!         <a href="https://man.openbsd.org/strlcat.3">strlcat(3)</a>:
!         Todd Miller and Theo de Raadt, July 1, 1998, OpenBSD 2.4
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/strtonum.3">strtonum(3)</a>:
!         Ted Unangst, Todd Miller, and Theo de Raadt, May 3, 2004, OpenBSD 3.6
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/imsg_init.3">imsg</a>:
!         Message passing API, written by Henning Brauer.
!         In libutil since May 26, 2010, OpenBSD 4.8;
!         used by various daemons before that.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/timingsafe_bcmp.3">timingsafe_bcmp(3)</a>:
!         Damien Miller, July 13, 2010, OpenBSD 4.9
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/explicit_bzero.3">explicit_bzero(3)</a>:
!         Ted Unangst and Matthew Dempsky, January 22, 2014, OpenBSD 5.5
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ohash_init.3">ohash</a>:
!         Written and maintained by Marc Espie.
!         In libutil since May 12, 2014, OpenBSD 5.6;
!         used by make(1) and m4(1) before that.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/asr_run.3">asr</a>:
!         Replacement resolver written and maintained by Eric Faurot.
!         Imported April 14, 2012; activated on March 26, 2014, OpenBSD 5.6.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/reallocarray.3">reallocarray(3)</a>:
!         Theo de Raadt and Ted Unangst, April 22, 2014, OpenBSD 5.6
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/getentropy.2">getentropy(2)</a>:
!         Matthew Dempsky and Theo de Raadt, June 13, 2014, OpenBSD 5.6
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/sendsyslog.2">sendsyslog(2)</a>:
!         Theo de Raadt, July 10, 2014, OpenBSD 5.6
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/timingsafe_memcmp.3">timingsafe_memcmp(3)</a>:
!         Matthew Dempsky, July 13, 2014, OpenBSD 5.6
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/pledge.2">pledge(2)</a>:
!         Theo de Raadt, July 19, 2015, OpenBSD 5.9
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/getpwnam_shadow.3">getpwnam_shadow(3)</a>,
!         <a href="https://man.openbsd.org/getpwuid_shadow.3">getpwuid_shadow(3)</a>:
!         Ted Unangst and Theo de Raadt, November 18, 2015, OpenBSD 5.9
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/recallocarray.3">recallocarray(3)</a>:
!         Otto Moerbeek, Joel Sing and Theo de Raadt, March 6, 2017, OpenBSD 6.1
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/freezero.3">freezero(3)</a>:
!         Otto Moerbeek, April 10, 2017, OpenBSD 6.2
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/unveil.2">unveil(2)</a>:
!         Theo de Raadt and Bob Beck, July 13, 2018, OpenBSD 6.4
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/malloc_conceal.3">malloc_conceal(3)</a>
  	and
!         <a href="https://man.openbsd.org/calloc_conceal.3">calloc_conceal(3)</a>:
!         Otto Moerbeek, May 10, 2019, OpenBSD 6.5
!     </li>
  </ul>
  
  
  <h3>Programs and subsystems</h3>
  
  <ul>
!     <li>
!         <a href="https://man.openbsd.org/ypbind.8">ypbind(8)</a>,
!         <a href="https://man.openbsd.org/ypset.8">ypset(8)</a>,
!         <a href="https://man.openbsd.org/ypcat.1">ypcat(1)</a>,
!         <a href="https://man.openbsd.org/ypmatch.1">ypmatch(1)</a>,
!         <a href="https://man.openbsd.org/ypwhich.1">ypwhich(1)</a>,
!         and libc support: Started by Theo de Raadt.
!         Imported April 26, 1993 and first released with NetBSD 0.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ypserv.8">ypserv(8)</a>:
!         Started by Mats O. Jansson in 1994.
!         Imported October 23, 1995 and first released with OpenBSD 2.0.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/mopd.8">mopd(8)</a>:
!         Started by Mats O. Jansson in 1993.
!         Imported September 21, 1996 and first released with OpenBSD 2.0.
!     </li>
!     <li>
!         <a href="anoncvs.html">AnonCVS</a>:
!         Designed and implemented by Chuck Cranor and Theo de Raadt in 1995
!         (<a href="papers/anoncvs-paper.pdf">paper</a>,
!         <a href="papers/anoncvs-slides.pdf">slides</a>)
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/aucat.1">aucat(1)</a>:
!         Started by Kenneth Stailey.
!         Imported January 2, 1997 and first released with OpenBSD 2.1.
!         Now maintained by Alexandre Ratchov.
!     </li>
!     <li>
!         <a href="https://www.openssh.com/">OpenSSH</a>
!         including <a href="https://man.openbsd.org/ssh.1">ssh(1)</a>,
!         <a href="https://man.openbsd.org/scp.1">scp(1)</a>,
!         <a href="https://man.openbsd.org/sftp.1">sftp(1)</a>,
!         <a href="https://man.openbsd.org/ssh-add.1">ssh-add(1)</a>,
!         <a href="https://man.openbsd.org/ssh-agent.1">ssh-agent(1)</a>,
!         <a href="https://man.openbsd.org/ssh-keygen.1">ssh-keygen(1)</a>,
!         <a href="https://man.openbsd.org/sshd.8">sshd(8)</a>,
!         <a href="https://man.openbsd.org/sftp-server.8">sftp-server(8)</a>:
!         Started by Aaron Campbell, Bob Beck, Dug Song, Markus Friedl,
!         Niels Provos, and Theo de Raadt
!         as a fork of SSH 1.2.12 by Tatu Ylonen.
!         Imported September 26, 1999 and first released with OpenBSD 2.6.
!         Now maintained by Markus Friedl, Damien Miller, Darren Tucker, and
!         Theo de Raadt.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/mg.1">mg(1)</a>:
!         Started by Dave Conroy in November 1986.
!         Imported February 25, 2000 and first released with OpenBSD 2.7.
!         Now maintained by Mark Lumsden.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/m4.1">m4(1)</a>:
!         Originally implemented by Ozan Yigit and Richard A. O'Keefe for 4.3BSD-Reno.
!         Considerably extended and maintained by Marc Espie since 1999.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/pf.4">pf(4)</a>,
!         <a href="https://man.openbsd.org/pfctl.8">pfctl(8)</a>,
!         <a href="https://man.openbsd.org/pflogd.8">pflogd(8)</a>,
!         <a href="https://man.openbsd.org/authpf.8">authpf(8)</a>,
!         <a href="https://man.openbsd.org/ftp-proxy.8">ftp-proxy(8)</a>:
!         Started by Daniel Hartmeier as a replacement for the non-free ipf by
!         Darren Reed. Imported June 24, 2001 and first released with OpenBSD
!         3.0. Now maintained by Henning Brauer.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/OpenBSD-5.9/systrace.4">systrace(4)</a>,
!         <a href="https://man.openbsd.org/OpenBSD-5.9/systrace.1">systrace(1)</a>:
!         Started by Niels Provos.
!         Imported June 4, 2002 and first released with OpenBSD 3.2.
!         Deleted after OpenBSD 5.9 because
!         <a href="https://man.openbsd.org/pledge.2">pledge(2)</a> is even better.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/spamd.8">spamd(8)</a>:
!         Written by Bob Beck. Imported December 21, 2002 and first released with
!         OpenBSD 3.3.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/dc.1">dc(1)</a>:
!         Written and maintained by Otto Moerbeek.
!         Imported September 19, 2003 and first released with OpenBSD 3.5.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/bc.1">bc(1)</a>:
!         Written and maintained by Otto Moerbeek.
!         Imported September 25, 2003 and first released with OpenBSD 3.5.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/sensorsd.8">sensorsd(8)</a>:
!         Started by Henning Brauer.
!         Imported September 24, 2003 and first released with OpenBSD 3.5.
!         Reworked by Constantine A. Murenin.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/pkg_add.1">pkg_add(1)</a>:
!         Written and maintained by Marc Espie.
!         Imported October 16, 2003 and first released with OpenBSD 3.5.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/carp.4">carp(4)</a>:
!         Written by Mickey Shalayeff, Markus Friedl, Marco Pfatschbacher,
!         and Ryan McBride.
!         Imported October 17, 2003 and first released with OpenBSD 3.5.
!     </li>
!     <li>
!         <a href="http://www.openbgpd.org/">OpenBGPD</a>
!         including <a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>
!         and <a href="https://man.openbsd.org/bgpctl.8">bgpctl(8)</a>:
!         Written and maintained by Henning Brauer and Claudio Jeker,
!         and also maintained by Peter Hessler.
!         Imported December 17, 2003 and first released with OpenBSD 3.5.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/dhclient.8">dhclient(8)</a>:
!         Started by Ted Lemon and Elliot Poger in 1996.
!         Imported January 18, 2004 and first released with OpenBSD 3.5.
!         Reworked by Henning Brauer.
!         Now maintained by Kenneth Westerback.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/dhcpd.8">dhcpd(8)</a>:
!         Started by Ted Lemon in 1995.
!         Imported April 13, 2004 and first released with OpenBSD 3.6.
!         Reworked by Henning Brauer.
!         Now maintained by Kenneth Westerback.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/hotplugd.8">hotplugd(8)</a>:
!         Started by Alexander Yurchenko.
!         Imported May 30, 2004 and first released with OpenBSD 3.6.
!     </li>
!     <li>
!         <a href="http://www.openntpd.org/">OpenNTPD</a>
!         including <a href="https://man.openbsd.org/ntpd.8">ntpd(8)</a>
!         and <a href="https://man.openbsd.org/ntpctl.8">ntpctl(8)</a>:
!         Written and maintained by Henning Brauer.
!         Imported May 31, 2004 and first released with OpenBSD 3.6.
!         Portable version maintained by Brent Cook.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/dpb.1">dpb(1)</a>:
!         Started by Nikolay Sturm on August 10, 2004; first available for OpenBSD 3.6.
!         Rewritten and maintained by Marc Espie since August 20, 2010.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ospfd.8">ospfd(8)</a>,
!         <a href="https://man.openbsd.org/ospfctl.8">ospfctl(8)</a>:
!         Started by Esben Norby and Claudio Jeker.
!         Imported January 28, 2005 and first released with OpenBSD 3.7.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ifstated.8">ifstated(8)</a>:
!         Started by Marco Pfatschbacher and Ryan McBride.
!         Imported January 23, 2004 and first released with OpenBSD 3.8.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/bioctl.8">bioctl(8)</a>:
!         Started by Marco Peereboom.
!         Imported March 29, 2005 and first released with OpenBSD 3.8.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/hostapd.8">hostapd(8)</a>:
!         Written and maintained by Reyk Floeter.
!         Imported May 26, 2005 and first released with OpenBSD 3.8.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/watchdogd.8">watchdogd(8)</a>:
!         Started by Marc Balmer.
!         Imported August 8, 2005 and first released with OpenBSD 3.8.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/sdiff.1">sdiff(1)</a>:
!         Written by Ray Lai.
!         Imported December 27, 2005 and first released with OpenBSD 3.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/dvmrpd.8">dvmrpd(8)</a>,
!         <a href="https://man.openbsd.org/dvmrpctl.8">dvmrpctl(8)</a>:
!         Started by Esben Norby.
!         Imported June 1, 2006 and first released with OpenBSD 4.0.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ripd.8">ripd(8)</a>,
!         <a href="https://man.openbsd.org/ripctl.8">ripctl(8)</a>:
!         Started by Michele Marchetto.
!         Imported October 18, 2006 and first released with OpenBSD 4.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/pkg-config.1">pkg-config(1)</a>:
!         Started by Chris Kuethe and Marc Espie.
!         Imported November 27, 2006 and first released with OpenBSD 4.1.
!         Now maintained by Jasper Lievisse Adriaanse.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/relayd.8">relayd(8)</a>
!         with <a href="https://man.openbsd.org/relayctl.8">relayctl(8)</a>:
!         Started by Pierre-Yves Ritschard and Reyk Floeter.
!         Imported December 16, 2006 and first released with OpenBSD 4.1.
!         Now maintained by Reyk Floeter and Sebastian Benoit.<br/>
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/cwm.1">cwm(1)</a>:
!         Started by <a href="http://monkey.org/~marius/cwm/README">Marius
!             Aamodt Eriksen</A> in 2004.
!         Imported April 27, 2007 and first released with OpenBSD 4.2.
!         Now maintained by Okan Demirmen.
!         <a href="https://github.com/chneukirchen/cwm">Portable version</a>
!         maintained by Leah Neukirchen.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ospf6d.8">ospf6d(8)</a>,
!         <a href="https://man.openbsd.org/ospf6ctl.8">ospf6ctl(8)</a>:
!         Started by Esben Norby and Claudio Jeker.
!         Imported October 8, 2007 and first released with OpenBSD 4.2.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/libtool.1">libtool(1)</a>:
!         Written by Steven Mestdagh and Marc Espie.
!         Imported October 28, 2007 and first available for OpenBSD 4.3.
!         Now maintained by Marc Espie, Jasper Lievisse Adriaanse,
!         and Antoine Jacoutot.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/snmpd.8">snmpd(8)</a>,
!         <a href="https://man.openbsd.org/snmpctl.8">snmpctl(8)</a>:
!         Started by Reyk Floeter.
!         Imported December 5, 2007 and first released with OpenBSD 4.3.
!         Maintained by Reyk Floeter and Bret Lambert.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/sysmerge.8">sysmerge(8)</a>:
!         Written and maintained by Antoine Jacoutot,
!         originally forked from mergemaster by Douglas Barton.
!         Imported April 22, 2008, first released with OpenBSD 4.4.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ypldap.8">ypldap(8)</a>:
!         Started by Pierre-Yves Ritschard.
!         Imported June 26, 2008 and first released with OpenBSD 4.4.
!     </li>
!     <li>
!         <a href="https://www.opensmtpd.org/">OpenSMTPD</a>
!         including <a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>,
!         <a href="https://man.openbsd.org/smtpctl.8">smtpctl(8)</a>,
!         <a href="https://man.openbsd.org/makemap.8">makemap(8)</a>:
!         Started by Gilles Chehade.
!         Imported November 1, 2008 and first released with OpenBSD 4.6.
!         Now maintained by Gilles Chehade and Eric Faurot.
!     </li>
!     <li>
!         <a href="http://tmux.github.io/">tmux</a>,
!         <a href="https://man.openbsd.org/tmux.1">tmux(1)</a>:
!         Started in 2007 and maintained by Nicholas Marriott.
!         Imported June 1, 2009, first released with OpenBSD 4.6.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ldpd.8">ldpd(8)</a>,
!         <a href="https://man.openbsd.org/ldpctl.8">ldpctl(8)</a>:
!         Started by Michele Marchetto.
!         Imported June 1, 2009 and first released with OpenBSD 4.6.
!         Now maintained by Claudio Jeker.
!     </li>
!     <li>
!         <a href="http://mdocml.bsd.lv/">mandoc</a>
!         including <a href="https://man.openbsd.org/mandoc.1">mandoc(1)</a>,
!         <a href="https://man.openbsd.org/man.1">man(1)</a>,
!         <a href="https://man.openbsd.org/apropos.1">apropos(1)</a>,
!         <a href="https://man.openbsd.org/makewhatis.8">makewhatis(8)</a>,
!         <a href="https://man.openbsd.org/man.cgi.8">man.cgi(8)</a>:
!         Started by Kristaps Dzonsons in November 2008.
!         Imported April 6, 2009, first released with OpenBSD 4.8.
!         Now maintained by Ingo Schwarze.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ldapd.8">ldapd(8)</a>,
!         <a href="https://man.openbsd.org/ldapctl.8">ldapctl(8)</a>:
!         Written by Martin Hedenfalk.
!         Imported May 31, 2010 and first released with OpenBSD 4.8.
!     </li>
!     <li>
!         <a href="http://www.openiked.org/">OpenIKED</a>
!         including <a href="https://man.openbsd.org/iked.8">iked(8)</a>
!         and <a href="https://man.openbsd.org/ikectl.8">ikectl(8)</a>:
!         Started by Reyk Floeter.
!         Imported June 3, 2010 and first released with OpenBSD 4.8.
!         Now maintained by Reyk Floeter and Mike Belopuhov.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/iscsid.8">iscsid(8)</a>,
!         <a href="https://man.openbsd.org/iscsictl.8">iscsictl(8)</a>:
!         Written and maintained by Claudio Jeker.
!         Imported September 24, 2010 and first released with OpenBSD 4.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/rc.d.8">rc.d(8)</a>,
!         <a href="https://man.openbsd.org/rc.subr.8">rc.subr(8)</a>:
!         Written and maintained by Robert Nagy and Antoine Jacoutot.
!         Imported October 26, 2010 and first released with OpenBSD 4.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/tftpd.8">tftpd(8)</a>:
!         Written and maintained by David Gwynne.
!         Imported March 2, 2012 and first released with OpenBSD 5.2.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/npppd.8">npppd(8)</a>,
!         <a href="https://man.openbsd.org/npppctl.8">npppctl(8)</a>:
!         Started by Internet Initiative Japan Inc.
!         Imported January 11, 2010, first released with OpenBSD 5.3.
!         Maintained by YASUOKA Masahiko.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ldomd.8">ldomd(8)</a>,
!         <a href="https://man.openbsd.org/ldomctl.8">ldomctl(8)</a>:
!         Written and maintained by Mark Kettenis.
!         Imported October 26, 2012 and first released with OpenBSD 5.3.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/sndiod.8">sndiod(8)</a>:
!         Written and maintained by Alexandre Ratchov.
!         Imported November 23, 2012 and first released with OpenBSD 5.3.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/cu.1">cu(1)</a>:
!         Written and maintained by Nicholas Marriott.
!         Imported July 10, 2012 and first released with OpenBSD 5.4.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/identd.8">identd(8)</a>:
!         Written and maintained by David Gwynne.
!         Imported March 18, 2013 and first released with OpenBSD 5.4.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/slowcgi.8">slowcgi(8)</a>:
!         Written and maintained by Florian Obser.
!         Imported May 23, 2013 and first released with OpenBSD 5.4.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/signify.1">signify(1)</a>:
!         Written and maintained by <a href="http://www.tedunangst.com/flak/post/signify">Ted Unangst</a>.
!         Imported December 31, 2013 and first released with OpenBSD 5.5.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/htpasswd.1">htpasswd(1)</a>:
!         Written and maintained by Florian Obser.
!         Imported March 17, 2014 and first released with OpenBSD 5.6.
!     </li>
!     <li>
!         <a href="https://www.libressl.org/">LibreSSL</a>:
!         Started by Ted Unangst, Bob Beck, Joel Sing, Miod Vallat, Philip Guenther,
!         and Theo de Raadt on April 13, 2014, as a fork of OpenSSL 1.0.1g.
!         First released with OpenBSD 5.6.
!         Portable version maintained by Brent Cook.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/httpd.8">httpd(8)</a>:
!         Started by Reyk Floeter.
!         Imported July 12, 2014 and first released with OpenBSD 5.6.
!         Maintained by Reyk Floeter and Florian Obser.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/rcctl.8">rcctl(8)</a>:
!         Written and maintained by Antoine Jacoutot.
!         Imported August 19, 2014 and first released with OpenBSD 5.7.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/file.1">file(1)</a>:
!         Rewritten from scratch and maintained by Nicholas Marriott.
!         Imported April 24, 2015 and first released with OpenBSD 5.8.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/doas.1">doas(1)</a>:
!         Written and maintained by Ted Unangst.
!         Imported July 16, 2015 and first released with OpenBSD 5.8.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/radiusd.8">radiusd(8)</a>:
!         Written and maintained by YASUOKA Masahiko.
!         Imported July 21, 2015 and first released with OpenBSD 5.8.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/eigrpd.8">eigrpd(8)</a>,
!         <a href="https://man.openbsd.org/eigrpctl.8">eigrpctl(8)</a>:
!         Written and maintained by Renato Westphal.
!         Imported October 2, 2015 and first released with OpenBSD 5.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/rebound.8">rebound(8)</a>:
!         Written and maintained by Ted Unangst.
!         Imported October 15, 2015 and first released with OpenBSD 5.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/vmm.4">vmm(4)</a>,
!         <a href="https://man.openbsd.org/vmd.8">vmd(8)</a>,
!         <a href="https://man.openbsd.org/vmctl.8">vmctl(8)</a>:
!         Written and maintained by Mike Larkin and Reyk Floeter.
!         Imported November 13, 2015 and first released with OpenBSD 5.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/pdisk.8">pdisk(8)</a>:
!         Originally written by Eryk Vershen in 1996-1998,
!         rewritten and maintained by Kenneth Westerback since January 11, 2016
!         and first released with OpenBSD 5.9.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/mknod.8">mknod(8)</a>:
!         Original version from Version 6 AT&amp;T UNIX (1975),
!         last rewritten by Marc Espie on March 5, 2016
!         and first released with OpenBSD 6.0.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/audioctl.1">audioctl(1)</a>:
!         Originally written by Lennart Augustsson in 1997,
!         rewritten and maintained by Alexandre Ratchov since June 21, 2016
!         and first released with OpenBSD 6.0.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/switchd.8">switchd(8)</a>,
!         <a href="https://man.openbsd.org/switchctl.8">switchctl(8)</a>:
!         Written and maintained by Reyk Floeter.
!         Imported July 19, 2016; released with OpenBSD 6.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/acme-client.1">acme-client(1)</a>:
!         Written by Kristaps Dzonsons, imported August 31, 2016; released
!         with OpenBSD 6.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/syspatch.8">syspatch(8)</a>:
!         Written and maintained by Antoine Jacoutot.
!         Imported September 5, 2016; released with OpenBSD 6.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ping.8">ping(8)</a>:
!         Restructured to include IPv6 functionality and maintained by Florian Obser.
!         The separate
!         <a href="https://man.openbsd.org/OpenBSD-6.0/ping6.8">ping6(8)</a> 
!         was superseded on September 17, 2016,
!         and the new, combined version was released with OpenBSD 6.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/xenodm.1">xenodm(1)</a>:
!         Cleaned-up fork of
!         <a href="https://man.openbsd.org/OpenBSD-6.0/xdm.1">xdm(1)</a>
!         maintained by Matthieu Herrb.
!         Imported October 23, 2016; released with OpenBSD 6.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/ocspcheck.8">ocspcheck(8)</a>:
!         Written and maintained by Bob Beck.
!         Imported January 24, 2017; released with OpenBSD 6.1.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/slaacd.8">slaacd(8)</a>:
!         Written and maintained by Florian Obser.
!         Imported March 18, 2017; released with OpenBSD 6.2.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/rad.8">rad(8)</a>:
!         Written and maintained by Florian Obser.
!         Imported July 10, 2018; released with OpenBSD 6.4.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/unwind.8">unwind(8)</a>:
!         Written and maintained by Florian Obser.
!         Imported January 23, 2019; released with OpenBSD 6.5.
!     </li>
!     <li>
!         <a href="https://man.openbsd.org/openrsync.1">openrsync(1)</a>:
!         Written by Kristaps Dzonsons.
!         Imported February 10, 2019; released with OpenBSD 6.5.
!     </li>
  </ul>
  
  <h3>Projects maintained by OpenBSD developers outside OpenBSD</h3>
  
  <ul>
!     <li>
!         <a href="http://www.sudo.ws/">sudo</a>:
!         Started by Bob Coggeshall and Cliff Spencer around 1980.
!         Imported November 18, 1999, first released with OpenBSD 2.7.
!         Now maintained by Todd Miller.
!     </li>
!     <li>
!         <a href="http://bulabula.org/femail/">femail</a>:
!         Written and maintained by Henning Brauer.
!         Started in 2005, port available since September 22, 2005.
!     </li>
!     <li>
!         <a href="http://www.midish.org/">midish</a>:
!         Written and maintained by Alexandre Ratchov.
!         Started in 2003, port available since November 4, 2005.
!     </li>
!     <li>
!         <a href="https://github.com/nicm/fdm">fdm</a>:
!         Written and maintained by Nicholas Marriott.
!         Started in 2006, port available since January 18, 2007.
!     </li>
!     <li>
!         <a href="https://github.com/ajacoutot/toad/">toad</a>:
!         Written and maintained by Antoine Jacoutot.
!         Started in 2013, port available since October 8, 2013.
!     </li>
!     <li>
!         <a href="https://mandoc.bsd.lv/docbook2mdoc/">docbook2mdoc</a>:
!         Started by Kristaps Dzonsons in 2014, maintained by Ingo Schwarze.
!         Port available since April 3, 2014.
!     </li>
!     <li>
!         <a href="http://jasperla.github.io/portroach/">portroach</a>:
!         Written and maintained by Jasper Lievisse Adriaanse,
!         originally forked from FreeBSD's portscout.
!         Started in 2014, port available since September 5, 2014.
!     </li>
!     <li>
!         <a href="https://github.com/yasuoka/cvs2gitdump">cvs2gitdump</a>:
!         Written and maintained by YASUOKA Masahiko.
!         Started in 2012, port available since August 1, 2016.
!     </li>
  </ul>
--- 24,618 ----
  <h3>Concepts</h3>
  
  <ul>
!     <li><a href="https://man.openbsd.org/ipsec.4">ipsec(4)</a>:
! 	Started by John Ioannidis, Angelos D. Keromytis, Niels Provos, and
! 	Niklas Hallqvist, imported February 20, 1997.  OpenBSD was the first
! 	free operating system to provide an IPSec stack.
!     <li><a href="https://man.openbsd.org/inet6.4">inet6(4)</a>:
! 	First complete integration and adoption of IPv6 led by
! 	"Itojun" (Dr. Junichiro Hagino) [WIDE/KAME], Craig Metz [NRL], and
! 	Angelos D. Keromytis starting Jan 6, 1999.
! 	Almost fully operational Jun 6, 1999 during the
! 	<a href="hackathons.html">first OpenBSD hackathon</a>.
! 	OpenBSD 2.7.
!     <li><strong>Privilege separation</strong>:
! 	First implemented by
! 	<a href="http://www.citi.umich.edu/u/provos/ssh/privsep.html">Niels Provos</a>
! 	and Markus Friedl in OpenSSH in March 2002, released with OpenBSD 3.2.
! 	The concept is now used in many OpenBSD programs, for example
! 	<a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>,
! 	<a href="https://man.openbsd.org/dhclient.8">dhclient(8)</a>,
! 	<a href="https://man.openbsd.org/dhcpd.8">dhcpd(8)</a>,
! 	<a href="https://man.openbsd.org/dvmrpd.8">dvmrpd(8)</a>,
! 	<a href="https://man.openbsd.org/eigrpd.8">eigrpd(8)</a>,
! 	<a href="https://man.openbsd.org/file.1">file(1)</a>,
! 	<a href="https://man.openbsd.org/httpd.8">httpd(8)</a>,
! 	<a href="https://man.openbsd.org/iked.8">iked(8)</a>,
! 	<a href="https://man.openbsd.org/ldapd.8">ldapd(8)</a>,
! 	<a href="https://man.openbsd.org/ldpd.8">ldpd(8)</a>,
! 	<a href="https://man.openbsd.org/mountd.8">mountd(8)</a>,
! 	<a href="https://man.openbsd.org/npppd.8">npppd(8)</a>,
! 	<a href="https://man.openbsd.org/ntpd.8">ntpd(8)</a>,
! 	<a href="https://man.openbsd.org/ospfd.8">ospfd(8)</a>,
! 	<a href="https://man.openbsd.org/ospf6d.8">ospf6d(8)</a>,
! 	<a href="https://man.openbsd.org/pflogd.8">pflogd(8)</a>,
! 	<a href="https://man.openbsd.org/radiusd.8">radiusd(8)</a>,
! 	<a href="https://man.openbsd.org/relayd.8">relayd(8)</a>,
! 	<a href="https://man.openbsd.org/ripd.8">ripd(8)</a>,
! 	<a href="https://man.openbsd.org/script.1">script(1)</a>,
! 	<a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>,
! 	<a href="https://man.openbsd.org/syslogd.8">syslogd(8)</a>,
! 	<a href="https://man.openbsd.org/tcpdump.8">tcpdump(8)</a>,
! 	<a href="https://man.openbsd.org/tmux.1">tmux(1)</a>,
! 	<a href="https://man.openbsd.org/xconsole.1">xconsole(1)</a>,
! 	<a href="https://man.openbsd.org/xdm.1">xdm(1)</a>,
! 	<a href="https://man.openbsd.org/Xserver.1">Xserver(1)</a>,
! 	<a href="https://man.openbsd.org/ypldap.8">ypldap(8)</a>,
! 	<a href="https://man.openbsd.org/pkg_add.1">pkg_add(1)</a>,
! 	etc.
!     <li><strong>Privilege revocation</strong>:
! 	Related to the work on privilege separation, some programs were refactored
! 	to drop privileges while holding onto a tricky resource such as a raw socket,
! 	reserved port, or modification-locked bpf(4) descriptor,
! 	for example
! 	<a href="https://man.openbsd.org/ping.8">ping(8)</a>,
! 	<a href="https://man.openbsd.org/traceroute.8">traceroute(8)</a>,
! 	etc.
!     <li><strong>Stack protector</strong>:
! 	Developed since 2001 as "propolice" by Hiroaki Etoh. Integrated, and
! 	implemented for additional hardware platforms, by Miod Vallat and Theo
! 	de Raadt.  OpenBSD 3.3 was the first operating system to enable it
! 	systemwide by default.
!     <li><strong>W^X</strong>:
! 	First used for sparc, sparc64, alpha, and hppa in OpenBSD 3.3.
! 	Strictly enforced by default since OpenBSD 6.0: a program can only
! 	violate it if the executable is marked with <code>PT_OPENBSD_WXNEEDED</code>
! 	and it is located on a filesystem mounted with the <code>wxallowed</code>
! 	<a href="https://man.openbsd.org/mount.8">mount(8)</a> option.
!     <li><strong>GOT and PLT protection</strong> by ld.so:
! 	first done as part of the W^X work in OpenBSD 3.3, by Dale Rahn and
! 	Theo de Raadt. The GOT and PLT regions are read-only outside of ld.so
! 	itself. Extended to the .init/.fini sections (constructors and
! 	destructors) in OpenBSD 3.4.
!     <li><strong>ASLR</strong>:
! 	OpenBSD 3.4 was the first widely used operating system to
! 	provide it by default.
!     <li><a href="https://man.openbsd.org/gcc-local.1">gcc-local(1)</a>
! 	__attribute__((__bounded__)) static analysis annotation
! 	and checking mechanism:
! 	Started by Anil Madhavapeddy on June 26, 2003
! 	and ported to GCC 4 by Nicholas Marriott.
! 	First released with OpenBSD 3.4.
!     <li><a href="https://man.openbsd.org/malloc.3">malloc(3)</a>
! 	randomization implemented by Thierry Deval. Guard pages and randomized (delayed) free added by Ted Unangst.
! 	Reimplemented by <a href="papers/eurobsdcon2009/otto-malloc.pdf">Otto Moerbeek</a>
! 	for OpenBSD 4.4.
!     <li><strong>Position-independent executables (PIE)</strong>:
! 	OpenBSD 5.3 was the first widely used operating system to enable it
! 	globally by default, on seven hardware platforms.
! 	Implemented in November 2008 by
! 	<a href="https://www.openbsd.org/papers/nycbsdcon08-pie/">Kurt Miller</a>
! 	and enabled by default by
! 	<a href="https://www.openbsd.org/papers/asiabsdcon2015-pie-slides.pdf">Pascal Stumpf</a>
! 	in August 2012.
!     <li><strong>Random-data memory</strong>:
! 	the ability to specify that a variable should be initialized
  	at load time with random byte values (placed into a new ELF
  	<b>.openbsd.randomdata</b> section) was implemented in
  	OpenBSD 5.3 by Matthew Dempsky.
!     <li><strong>Stack protector per shared object</strong>:
! 	using the random-data memory feature, each shared object was given its
! 	own stack protector cookie in OpenBSD 5.3 by Matthew Dempsky.
!     <li><strong>Static-PIE</strong>:
! 	Position-independent static binaries for /bin, /sbin and ramdisks.
! 	Implemented for OpenBSD 5.7 by Kurt Miller and Mark Kettenis.
!     <li><strong>SROP</strong>
! 	(<a href="https://man.openbsd.org/sigreturn.2">sigreturn(2)</a>
! 	oriented programming) mitigation: attacks researched by
! 	<a href="http://www.cs.vu.nl/~herbertb/papers/srop_sp14.pdf">Eric Bosman</a>
! 	and Herbert Bos in 2014, solution implemented by Theo de Raadt in May 2016, 
! 	enabled by default since OpenBSD 6.0.
!     <li><strong>Library order randomization</strong>:
! 	In <a href="https://man.openbsd.org/rc.8">rc(8)</a>, re-link
! 	<code>libc.so</code>, <code>libcrypto</code>, and <code>ld.so</code>
! 	on startup, placing the objects in a random order.
! 	Theo de Raadt and Robert Peichaer, May 2016,
! 	enabled by default since OpenBSD 6.0 and 6.2.
!     <li>Kernel-assisted lazy-binding for W^X safety in multi-threaded programs.
! 	A new syscall <a href="https://man.openbsd.org/kbind.2">kbind(2)</a>
! 	permits lazy-binding to be W^X safe in multi-threaded programs.
! 	Implemented for OpenBSD 5.9 by Philip Guenther in July 2015.
!     <li>Process layouts in memory tightened to remove execute permission from
! 	all segmented, non-instruction data and to remove write permission from
! 	data that is only modified during loading and relocation.
! 	By combining the RELRO (Read-Only after Relocation) design from the
! 	GNU project with the original ASLR work from OpenBSD 3.3 and
! 	strict lazy-binding work from OpenBSD 5.9, this is applied to not
! 	just a subset of programs and libraries but rather to all programs
! 	and libraries.
! 	Implemented for OpenBSD 6.1 by Philip Guenther in August 2016.
!     <li>Use of <strong>fork+exec in privilege separated programs</strong>. The
! 	strategy is to give each process a fresh &amp; unique address space for
! 	ASLR, stack protector -- as protection against address space discovery attacks.
! 	Implemented first by
! 	Damien Miller (<a href="https://man.openbsd.org/sshd.8">sshd(8)</a> 2004),
! 	Claudio Jeker (<a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>, 2015),
! 	Eric Faurot (<a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>, 2016),
! 	Rafael Zalamena (various, 2016), and others.
!     <li><strong>trapsleds</strong>:
! 	Reduction of incidental NOP instructions/sequences in the instruction
! 	stream which could be useful potentially for ROP attack methods to
! 	innaccurately target gadgets. These NOP sequences are converted into
! 	trap sequences where possible. Todd Mortimer and Theo de Raadt, June
! 	2017.
!     <li><strong>Kernel relinking at boot</strong>: 
! 	the .o files of the kernel are relinked in random order from a
! 	link-kit, before every reboot. This provides substantial interior
! 	randomization in the kernel's text and data segments for layout and
! 	relative branches/calls.  Basically a unique address space for each
! 	kernel boot, similar to the userland fork+exec model described above
! 	but for the kernel.  Theo de Raadt, June 2017.
      <li>
  	Rearranged i386/amd64 register allocator order in 
  	<a href="https://man.openbsd.org/clang.1">clang(1)</a>
  	to reduce polymorphic RET instructions:
  	Todd Mortimer, November 20, 2017.
      <li>
  	Reencoding of i386/amd64 instruction sequences to avoid
  	embedded polymorphic RET instructions.  Enhancements to
  	<a href="https://man.openbsd.org/clang.1">clang(1)</a>
  	Todd Mortimer, April 28, 2018 and onwards.
!     <li><b>MAP_STACK</b> addition to 
  	<a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
  	allows opportunistic verification that the stack-register
  	points at stack memory, therefore catching pivots to non-stack
  	memory (sometimes used in ROP attacks).
  	Theo de Raadt, April 12, 2018.
!     <li><b>RETGUARD</b> is a replacement for the <b>stack-protector</b>
! 	which uses a per-function random cookie (located in the read-only ELF
! 	<b>.openbsd.randomdata</b> section) to consistency-check the
! 	return address on the stack.  Implemented for AMD64 and ARM64
! 	by Todd Mortimer in OpenBSD 6.4.
!     <li><b>MAP_CONCEAL</b> addition to 
  	<a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
  	disallows memory pages to be written to core dumps, preventing
  	accidental exposure of private information.
  	Theo de Raadt, Mark Kettenis and Scott Soule Cheloha,
  	February 2, 2019.
  
  </ul>
  
  <h3>Functions</h3>
  
  <ul>
!     <li><a href="https://man.openbsd.org/issetugid.2">issetugid(2)</a>:
! 	Theo de Raadt, August 25, 1996, OpenBSD 2.0
!     <li><a href="https://man.openbsd.org/arc4random.3">arc4random(3)</a>:
! 	David Mazieres, December 28, 1996, OpenBSD 2.1
!     <li><a href="https://man.openbsd.org/bcrypt.3">bcrypt(3)</a>:
! 	Implemented by <a href="https://www.usenix.org/legacy/events/usenix99/provos/provos_html/node1.html">Niels Provos and David Mazieres</a>
! 	Imported February 13, 1997 and first released with OpenBSD 2.1.
!     <li><a href="https://man.openbsd.org/strlcpy.3">strlcpy(3)</a>,
! 	<a href="https://man.openbsd.org/strlcat.3">strlcat(3)</a>:
! 	Todd Miller and Theo de Raadt, July 1, 1998, OpenBSD 2.4
!     <li><a href="https://man.openbsd.org/strtonum.3">strtonum(3)</a>:
! 	Ted Unangst, Todd Miller, and Theo de Raadt, May 3, 2004, OpenBSD 3.6
!     <li><a href="https://man.openbsd.org/imsg_init.3">imsg</a>:
! 	Message passing API, written by Henning Brauer.
! 	In libutil since May 26, 2010, OpenBSD 4.8;
! 	used by various daemons before that.
!     <li><a href="https://man.openbsd.org/timingsafe_bcmp.3">timingsafe_bcmp(3)</a>:
! 	Damien Miller, July 13, 2010, OpenBSD 4.9
!     <li><a href="https://man.openbsd.org/explicit_bzero.3">explicit_bzero(3)</a>:
! 	Ted Unangst and Matthew Dempsky, January 22, 2014, OpenBSD 5.5
!     <li><a href="https://man.openbsd.org/ohash_init.3">ohash</a>:
! 	Written and maintained by Marc Espie.
! 	In libutil since May 12, 2014, OpenBSD 5.6;
! 	used by make(1) and m4(1) before that.
!     <li><a href="https://man.openbsd.org/asr_run.3">asr</a>:
! 	Replacement resolver written and maintained by Eric Faurot.
! 	Imported April 14, 2012; activated on March 26, 2014, OpenBSD 5.6.
!     <li><a href="https://man.openbsd.org/reallocarray.3">reallocarray(3)</a>:
! 	Theo de Raadt and Ted Unangst, April 22, 2014, OpenBSD 5.6
!     <li><a href="https://man.openbsd.org/getentropy.2">getentropy(2)</a>:
! 	Matthew Dempsky and Theo de Raadt, June 13, 2014, OpenBSD 5.6
!     <li><a href="https://man.openbsd.org/sendsyslog.2">sendsyslog(2)</a>:
! 	Theo de Raadt, July 10, 2014, OpenBSD 5.6
!     <li><a href="https://man.openbsd.org/timingsafe_memcmp.3">timingsafe_memcmp(3)</a>:
! 	Matthew Dempsky, July 13, 2014, OpenBSD 5.6
!     <li><a href="https://man.openbsd.org/pledge.2">pledge(2)</a>:
! 	Theo de Raadt, July 19, 2015, OpenBSD 5.9
!     <li><a href="https://man.openbsd.org/getpwnam_shadow.3">getpwnam_shadow(3)</a>,
! 	<a href="https://man.openbsd.org/getpwuid_shadow.3">getpwuid_shadow(3)</a>:
! 	Ted Unangst and Theo de Raadt, November 18, 2015, OpenBSD 5.9
!     <li><a href="https://man.openbsd.org/recallocarray.3">recallocarray(3)</a>:
! 	Otto Moerbeek, Joel Sing and Theo de Raadt, March 6, 2017, OpenBSD 6.1
!     <li><a href="https://man.openbsd.org/freezero.3">freezero(3)</a>:
! 	Otto Moerbeek, April 10, 2017, OpenBSD 6.2
!     <li><a href="https://man.openbsd.org/unveil.2">unveil(2)</a>:
! 	Theo de Raadt and Bob Beck, July 13, 2018, OpenBSD 6.4
!     <li><a href="https://man.openbsd.org/malloc_conceal.3">malloc_conceal(3)</a>
  	and
! 	<a href="https://man.openbsd.org/calloc_conceal.3">calloc_conceal(3)</a>:
! 	Otto Moerbeek, May 10, 2019, OpenBSD 6.5
  </ul>
  
  
  <h3>Programs and subsystems</h3>
  
  <ul>
!     <li><a href="https://man.openbsd.org/ypbind.8">ypbind(8)</a>,
! 	<a href="https://man.openbsd.org/ypset.8">ypset(8)</a>,
! 	<a href="https://man.openbsd.org/ypcat.1">ypcat(1)</a>,
! 	<a href="https://man.openbsd.org/ypmatch.1">ypmatch(1)</a>,
! 	<a href="https://man.openbsd.org/ypwhich.1">ypwhich(1)</a>,
! 	and libc support: Started by Theo de Raadt.
! 	Imported April 26, 1993 and first released with NetBSD 0.9.
!     <li><a href="https://man.openbsd.org/ypserv.8">ypserv(8)</a>:
! 	Started by Mats O. Jansson in 1994.
! 	Imported October 23, 1995 and first released with OpenBSD 2.0.
!     <li><a href="https://man.openbsd.org/mopd.8">mopd(8)</a>:
! 	Started by Mats O. Jansson in 1993.
! 	Imported September 21, 1996 and first released with OpenBSD 2.0.
!     <li><a href="anoncvs.html">AnonCVS</a>:
! 	Designed and implemented by Chuck Cranor and Theo de Raadt in 1995
! 	(<a href="papers/anoncvs-paper.pdf">paper</a>,
! 	<a href="papers/anoncvs-slides.pdf">slides</a>)
!     <li><a href="https://man.openbsd.org/aucat.1">aucat(1)</a>:
! 	Started by Kenneth Stailey.
! 	Imported January 2, 1997 and first released with OpenBSD 2.1.
! 	Now maintained by Alexandre Ratchov.
!     <li><a href="https://www.openssh.com/">OpenSSH</a>
! 	including <a href="https://man.openbsd.org/ssh.1">ssh(1)</a>,
! 	<a href="https://man.openbsd.org/scp.1">scp(1)</a>,
! 	<a href="https://man.openbsd.org/sftp.1">sftp(1)</a>,
! 	<a href="https://man.openbsd.org/ssh-add.1">ssh-add(1)</a>,
! 	<a href="https://man.openbsd.org/ssh-agent.1">ssh-agent(1)</a>,
! 	<a href="https://man.openbsd.org/ssh-keygen.1">ssh-keygen(1)</a>,
! 	<a href="https://man.openbsd.org/sshd.8">sshd(8)</a>,
! 	<a href="https://man.openbsd.org/sftp-server.8">sftp-server(8)</a>:
! 	Started by Aaron Campbell, Bob Beck, Dug Song, Markus Friedl,
! 	Niels Provos, and Theo de Raadt
! 	as a fork of SSH 1.2.12 by Tatu Ylonen.
! 	Imported September 26, 1999 and first released with OpenBSD 2.6.
! 	Now maintained by Markus Friedl, Damien Miller, Darren Tucker, and
! 	Theo de Raadt.
!     <li><a href="https://man.openbsd.org/mg.1">mg(1)</a>:
! 	Started by Dave Conroy in November 1986.
! 	Imported February 25, 2000 and first released with OpenBSD 2.7.
! 	Now maintained by Mark Lumsden.
!     <li><a href="https://man.openbsd.org/m4.1">m4(1)</a>:
! 	Originally implemented by Ozan Yigit and Richard A. O'Keefe for 4.3BSD-Reno.
! 	Considerably extended and maintained by Marc Espie since 1999.
!     <li><a href="https://man.openbsd.org/pf.4">pf(4)</a>,
! 	<a href="https://man.openbsd.org/pfctl.8">pfctl(8)</a>,
! 	<a href="https://man.openbsd.org/pflogd.8">pflogd(8)</a>,
! 	<a href="https://man.openbsd.org/authpf.8">authpf(8)</a>,
! 	<a href="https://man.openbsd.org/ftp-proxy.8">ftp-proxy(8)</a>:
! 	Started by Daniel Hartmeier as a replacement for the non-free ipf by
! 	Darren Reed. Imported June 24, 2001 and first released with OpenBSD
! 	3.0. Now maintained by Henning Brauer.
!     <li><a href="https://man.openbsd.org/OpenBSD-5.9/systrace.4">systrace(4)</a>,
! 	<a href="https://man.openbsd.org/OpenBSD-5.9/systrace.1">systrace(1)</a>:
! 	Started by Niels Provos.
! 	Imported June 4, 2002 and first released with OpenBSD 3.2.
! 	Deleted after OpenBSD 5.9 because
! 	<a href="https://man.openbsd.org/pledge.2">pledge(2)</a> is even better.
!     <li><a href="https://man.openbsd.org/spamd.8">spamd(8)</a>:
! 	Written by Bob Beck. Imported December 21, 2002 and first released with
! 	OpenBSD 3.3.
!     <li><a href="https://man.openbsd.org/dc.1">dc(1)</a>:
! 	Written and maintained by Otto Moerbeek.
! 	Imported September 19, 2003 and first released with OpenBSD 3.5.
!     <li><a href="https://man.openbsd.org/bc.1">bc(1)</a>:
! 	Written and maintained by Otto Moerbeek.
! 	Imported September 25, 2003 and first released with OpenBSD 3.5.
!     <li><a href="https://man.openbsd.org/sensorsd.8">sensorsd(8)</a>:
! 	Started by Henning Brauer.
! 	Imported September 24, 2003 and first released with OpenBSD 3.5.
! 	Reworked by Constantine A. Murenin.
!     <li><a href="https://man.openbsd.org/pkg_add.1">pkg_add(1)</a>:
! 	Written and maintained by Marc Espie.
! 	Imported October 16, 2003 and first released with OpenBSD 3.5.
!     <li><a href="https://man.openbsd.org/carp.4">carp(4)</a>:
! 	Written by Mickey Shalayeff, Markus Friedl, Marco Pfatschbacher,
! 	and Ryan McBride.
! 	Imported October 17, 2003 and first released with OpenBSD 3.5.
!     <li><a href="http://www.openbgpd.org/">OpenBGPD</a>
! 	including <a href="https://man.openbsd.org/bgpd.8">bgpd(8)</a>
! 	and <a href="https://man.openbsd.org/bgpctl.8">bgpctl(8)</a>:
! 	Written and maintained by Henning Brauer and Claudio Jeker,
! 	and also maintained by Peter Hessler.
! 	Imported December 17, 2003 and first released with OpenBSD 3.5.
!     <li><a href="https://man.openbsd.org/dhclient.8">dhclient(8)</a>:
! 	Started by Ted Lemon and Elliot Poger in 1996.
! 	Imported January 18, 2004 and first released with OpenBSD 3.5.
! 	Reworked by Henning Brauer.
! 	Now maintained by Kenneth Westerback.
!     <li><a href="https://man.openbsd.org/dhcpd.8">dhcpd(8)</a>:
! 	Started by Ted Lemon in 1995.
! 	Imported April 13, 2004 and first released with OpenBSD 3.6.
! 	Reworked by Henning Brauer.
! 	Now maintained by Kenneth Westerback.
!     <li><a href="https://man.openbsd.org/hotplugd.8">hotplugd(8)</a>:
! 	Started by Alexander Yurchenko.
! 	Imported May 30, 2004 and first released with OpenBSD 3.6.
!     <li><a href="http://www.openntpd.org/">OpenNTPD</a>
! 	including <a href="https://man.openbsd.org/ntpd.8">ntpd(8)</a>
! 	and <a href="https://man.openbsd.org/ntpctl.8">ntpctl(8)</a>:
! 	Written and maintained by Henning Brauer.
! 	Imported May 31, 2004 and first released with OpenBSD 3.6.
! 	Portable version maintained by Brent Cook.
!     <li><a href="https://man.openbsd.org/dpb.1">dpb(1)</a>:
! 	Started by Nikolay Sturm on August 10, 2004; first available for OpenBSD 3.6.
! 	Rewritten and maintained by Marc Espie since August 20, 2010.
!     <li><a href="https://man.openbsd.org/ospfd.8">ospfd(8)</a>,
! 	<a href="https://man.openbsd.org/ospfctl.8">ospfctl(8)</a>:
! 	Started by Esben Norby and Claudio Jeker.
! 	Imported January 28, 2005 and first released with OpenBSD 3.7.
!     <li><a href="https://man.openbsd.org/ifstated.8">ifstated(8)</a>:
! 	Started by Marco Pfatschbacher and Ryan McBride.
! 	Imported January 23, 2004 and first released with OpenBSD 3.8.
!     <li><a href="https://man.openbsd.org/bioctl.8">bioctl(8)</a>:
! 	Started by Marco Peereboom.
! 	Imported March 29, 2005 and first released with OpenBSD 3.8.
!     <li><a href="https://man.openbsd.org/hostapd.8">hostapd(8)</a>:
! 	Written and maintained by Reyk Floeter.
! 	Imported May 26, 2005 and first released with OpenBSD 3.8.
!     <li><a href="https://man.openbsd.org/watchdogd.8">watchdogd(8)</a>:
! 	Started by Marc Balmer.
! 	Imported August 8, 2005 and first released with OpenBSD 3.8.
!     <li><a href="https://man.openbsd.org/sdiff.1">sdiff(1)</a>:
! 	Written by Ray Lai.
! 	Imported December 27, 2005 and first released with OpenBSD 3.9.
!     <li><a href="https://man.openbsd.org/dvmrpd.8">dvmrpd(8)</a>,
! 	<a href="https://man.openbsd.org/dvmrpctl.8">dvmrpctl(8)</a>:
! 	Started by Esben Norby.
! 	Imported June 1, 2006 and first released with OpenBSD 4.0.
!     <li><a href="https://man.openbsd.org/ripd.8">ripd(8)</a>,
! 	<a href="https://man.openbsd.org/ripctl.8">ripctl(8)</a>:
! 	Started by Michele Marchetto.
! 	Imported October 18, 2006 and first released with OpenBSD 4.1.
!     <li><a href="https://man.openbsd.org/pkg-config.1">pkg-config(1)</a>:
! 	Started by Chris Kuethe and Marc Espie.
! 	Imported November 27, 2006 and first released with OpenBSD 4.1.
! 	Now maintained by Jasper Lievisse Adriaanse.
!     <li><a href="https://man.openbsd.org/relayd.8">relayd(8)</a>
! 	with <a href="https://man.openbsd.org/relayctl.8">relayctl(8)</a>:
! 	Started by Pierre-Yves Ritschard and Reyk Floeter.
! 	Imported December 16, 2006 and first released with OpenBSD 4.1.
! 	Now maintained by Reyk Floeter and Sebastian Benoit.<br/>
!     <li><a href="https://man.openbsd.org/cwm.1">cwm(1)</a>:
! 	Started by <a href="http://monkey.org/~marius/cwm/README">Marius
! 	    Aamodt Eriksen</A> in 2004.
! 	Imported April 27, 2007 and first released with OpenBSD 4.2.
! 	Now maintained by Okan Demirmen.
! 	<a href="https://github.com/chneukirchen/cwm">Portable version</a>
! 	maintained by Leah Neukirchen.
!     <li><a href="https://man.openbsd.org/ospf6d.8">ospf6d(8)</a>,
! 	<a href="https://man.openbsd.org/ospf6ctl.8">ospf6ctl(8)</a>:
! 	Started by Esben Norby and Claudio Jeker.
! 	Imported October 8, 2007 and first released with OpenBSD 4.2.
!     <li><a href="https://man.openbsd.org/libtool.1">libtool(1)</a>:
! 	Written by Steven Mestdagh and Marc Espie.
! 	Imported October 28, 2007 and first available for OpenBSD 4.3.
! 	Now maintained by Marc Espie, Jasper Lievisse Adriaanse,
! 	and Antoine Jacoutot.
!     <li><a href="https://man.openbsd.org/snmpd.8">snmpd(8)</a>,
! 	<a href="https://man.openbsd.org/snmpctl.8">snmpctl(8)</a>:
! 	Started by Reyk Floeter.
! 	Imported December 5, 2007 and first released with OpenBSD 4.3.
! 	Maintained by Reyk Floeter and Bret Lambert.
!     <li><a href="https://man.openbsd.org/sysmerge.8">sysmerge(8)</a>:
! 	Written and maintained by Antoine Jacoutot,
! 	originally forked from mergemaster by Douglas Barton.
! 	Imported April 22, 2008, first released with OpenBSD 4.4.
!     <li><a href="https://man.openbsd.org/ypldap.8">ypldap(8)</a>:
! 	Started by Pierre-Yves Ritschard.
! 	Imported June 26, 2008 and first released with OpenBSD 4.4.
!     <li><a href="https://www.opensmtpd.org/">OpenSMTPD</a>
! 	including <a href="https://man.openbsd.org/smtpd.8">smtpd(8)</a>,
! 	<a href="https://man.openbsd.org/smtpctl.8">smtpctl(8)</a>,
! 	<a href="https://man.openbsd.org/makemap.8">makemap(8)</a>:
! 	Started by Gilles Chehade.
! 	Imported November 1, 2008 and first released with OpenBSD 4.6.
! 	Now maintained by Gilles Chehade and Eric Faurot.
!     <li><a href="http://tmux.github.io/">tmux</a>,
! 	<a href="https://man.openbsd.org/tmux.1">tmux(1)</a>:
! 	Started in 2007 and maintained by Nicholas Marriott.
! 	Imported June 1, 2009, first released with OpenBSD 4.6.
!     <li><a href="https://man.openbsd.org/ldpd.8">ldpd(8)</a>,
! 	<a href="https://man.openbsd.org/ldpctl.8">ldpctl(8)</a>:
! 	Started by Michele Marchetto.
! 	Imported June 1, 2009 and first released with OpenBSD 4.6.
! 	Now maintained by Claudio Jeker.
!     <li><a href="http://mdocml.bsd.lv/">mandoc</a>
! 	including <a href="https://man.openbsd.org/mandoc.1">mandoc(1)</a>,
! 	<a href="https://man.openbsd.org/man.1">man(1)</a>,
! 	<a href="https://man.openbsd.org/apropos.1">apropos(1)</a>,
! 	<a href="https://man.openbsd.org/makewhatis.8">makewhatis(8)</a>,
! 	<a href="https://man.openbsd.org/man.cgi.8">man.cgi(8)</a>:
! 	Started by Kristaps Dzonsons in November 2008.
! 	Imported April 6, 2009, first released with OpenBSD 4.8.
! 	Now maintained by Ingo Schwarze.
!     <li><a href="https://man.openbsd.org/ldapd.8">ldapd(8)</a>,
! 	<a href="https://man.openbsd.org/ldapctl.8">ldapctl(8)</a>:
! 	Written by Martin Hedenfalk.
! 	Imported May 31, 2010 and first released with OpenBSD 4.8.
!     <li><a href="http://www.openiked.org/">OpenIKED</a>
! 	including <a href="https://man.openbsd.org/iked.8">iked(8)</a>
! 	and <a href="https://man.openbsd.org/ikectl.8">ikectl(8)</a>:
! 	Started by Reyk Floeter.
! 	Imported June 3, 2010 and first released with OpenBSD 4.8.
! 	Now maintained by Reyk Floeter and Mike Belopuhov.
!     <li><a href="https://man.openbsd.org/iscsid.8">iscsid(8)</a>,
! 	<a href="https://man.openbsd.org/iscsictl.8">iscsictl(8)</a>:
! 	Written and maintained by Claudio Jeker.
! 	Imported September 24, 2010 and first released with OpenBSD 4.9.
!     <li><a href="https://man.openbsd.org/rc.d.8">rc.d(8)</a>,
! 	<a href="https://man.openbsd.org/rc.subr.8">rc.subr(8)</a>:
! 	Written and maintained by Robert Nagy and Antoine Jacoutot.
! 	Imported October 26, 2010 and first released with OpenBSD 4.9.
!     <li><a href="https://man.openbsd.org/tftpd.8">tftpd(8)</a>:
! 	Written and maintained by David Gwynne.
! 	Imported March 2, 2012 and first released with OpenBSD 5.2.
!     <li><a href="https://man.openbsd.org/npppd.8">npppd(8)</a>,
! 	<a href="https://man.openbsd.org/npppctl.8">npppctl(8)</a>:
! 	Started by Internet Initiative Japan Inc.
! 	Imported January 11, 2010, first released with OpenBSD 5.3.
! 	Maintained by YASUOKA Masahiko.
!     <li><a href="https://man.openbsd.org/ldomd.8">ldomd(8)</a>,
! 	<a href="https://man.openbsd.org/ldomctl.8">ldomctl(8)</a>:
! 	Written and maintained by Mark Kettenis.
! 	Imported October 26, 2012 and first released with OpenBSD 5.3.
!     <li><a href="https://man.openbsd.org/sndiod.8">sndiod(8)</a>:
! 	Written and maintained by Alexandre Ratchov.
! 	Imported November 23, 2012 and first released with OpenBSD 5.3.
!     <li><a href="https://man.openbsd.org/cu.1">cu(1)</a>:
! 	Written and maintained by Nicholas Marriott.
! 	Imported July 10, 2012 and first released with OpenBSD 5.4.
!     <li><a href="https://man.openbsd.org/identd.8">identd(8)</a>:
! 	Written and maintained by David Gwynne.
! 	Imported March 18, 2013 and first released with OpenBSD 5.4.
!     <li><a href="https://man.openbsd.org/slowcgi.8">slowcgi(8)</a>:
! 	Written and maintained by Florian Obser.
! 	Imported May 23, 2013 and first released with OpenBSD 5.4.
!     <li><a href="https://man.openbsd.org/signify.1">signify(1)</a>:
! 	Written and maintained by <a href="http://www.tedunangst.com/flak/post/signify">Ted Unangst</a>.
! 	Imported December 31, 2013 and first released with OpenBSD 5.5.
!     <li><a href="https://man.openbsd.org/htpasswd.1">htpasswd(1)</a>:
! 	Written and maintained by Florian Obser.
! 	Imported March 17, 2014 and first released with OpenBSD 5.6.
!     <li><a href="https://www.libressl.org/">LibreSSL</a>:
! 	Started by Ted Unangst, Bob Beck, Joel Sing, Miod Vallat, Philip Guenther,
! 	and Theo de Raadt on April 13, 2014, as a fork of OpenSSL 1.0.1g.
! 	First released with OpenBSD 5.6.
! 	Portable version maintained by Brent Cook.
!     <li><a href="https://man.openbsd.org/httpd.8">httpd(8)</a>:
! 	Started by Reyk Floeter.
! 	Imported July 12, 2014 and first released with OpenBSD 5.6.
! 	Maintained by Reyk Floeter and Florian Obser.
!     <li><a href="https://man.openbsd.org/rcctl.8">rcctl(8)</a>:
! 	Written and maintained by Antoine Jacoutot.
! 	Imported August 19, 2014 and first released with OpenBSD 5.7.
!     <li><a href="https://man.openbsd.org/file.1">file(1)</a>:
! 	Rewritten from scratch and maintained by Nicholas Marriott.
! 	Imported April 24, 2015 and first released with OpenBSD 5.8.
!     <li><a href="https://man.openbsd.org/doas.1">doas(1)</a>:
! 	Written and maintained by Ted Unangst.
! 	Imported July 16, 2015 and first released with OpenBSD 5.8.
!     <li><a href="https://man.openbsd.org/radiusd.8">radiusd(8)</a>:
! 	Written and maintained by YASUOKA Masahiko.
! 	Imported July 21, 2015 and first released with OpenBSD 5.8.
!     <li><a href="https://man.openbsd.org/eigrpd.8">eigrpd(8)</a>,
! 	<a href="https://man.openbsd.org/eigrpctl.8">eigrpctl(8)</a>:
! 	Written and maintained by Renato Westphal.
! 	Imported October 2, 2015 and first released with OpenBSD 5.9.
!     <li><a href="https://man.openbsd.org/rebound.8">rebound(8)</a>:
! 	Written and maintained by Ted Unangst.
! 	Imported October 15, 2015 and first released with OpenBSD 5.9.
!     <li><a href="https://man.openbsd.org/vmm.4">vmm(4)</a>,
! 	<a href="https://man.openbsd.org/vmd.8">vmd(8)</a>,
! 	<a href="https://man.openbsd.org/vmctl.8">vmctl(8)</a>:
! 	Written and maintained by Mike Larkin and Reyk Floeter.
! 	Imported November 13, 2015 and first released with OpenBSD 5.9.
!     <li><a href="https://man.openbsd.org/pdisk.8">pdisk(8)</a>:
! 	Originally written by Eryk Vershen in 1996-1998,
! 	rewritten and maintained by Kenneth Westerback since January 11, 2016
! 	and first released with OpenBSD 5.9.
!     <li><a href="https://man.openbsd.org/mknod.8">mknod(8)</a>:
! 	Original version from Version 6 AT&amp;T UNIX (1975),
! 	last rewritten by Marc Espie on March 5, 2016
! 	and first released with OpenBSD 6.0.
!     <li><a href="https://man.openbsd.org/audioctl.1">audioctl(1)</a>:
! 	Originally written by Lennart Augustsson in 1997,
! 	rewritten and maintained by Alexandre Ratchov since June 21, 2016
! 	and first released with OpenBSD 6.0.
!     <li><a href="https://man.openbsd.org/switchd.8">switchd(8)</a>,
! 	<a href="https://man.openbsd.org/switchctl.8">switchctl(8)</a>:
! 	Written and maintained by Reyk Floeter.
! 	Imported July 19, 2016; released with OpenBSD 6.1.
!     <li><a href="https://man.openbsd.org/acme-client.1">acme-client(1)</a>:
! 	Written by Kristaps Dzonsons, imported August 31, 2016; released
! 	with OpenBSD 6.1.
!     <li><a href="https://man.openbsd.org/syspatch.8">syspatch(8)</a>:
! 	Written and maintained by Antoine Jacoutot.
! 	Imported September 5, 2016; released with OpenBSD 6.1.
!     <li><a href="https://man.openbsd.org/ping.8">ping(8)</a>:
! 	Restructured to include IPv6 functionality and maintained by Florian Obser.
! 	The separate
! 	<a href="https://man.openbsd.org/OpenBSD-6.0/ping6.8">ping6(8)</a> 
! 	was superseded on September 17, 2016,
! 	and the new, combined version was released with OpenBSD 6.1.
!     <li><a href="https://man.openbsd.org/xenodm.1">xenodm(1)</a>:
! 	Cleaned-up fork of
! 	<a href="https://man.openbsd.org/OpenBSD-6.0/xdm.1">xdm(1)</a>
! 	maintained by Matthieu Herrb.
! 	Imported October 23, 2016; released with OpenBSD 6.1.
!     <li><a href="https://man.openbsd.org/ocspcheck.8">ocspcheck(8)</a>:
! 	Written and maintained by Bob Beck.
! 	Imported January 24, 2017; released with OpenBSD 6.1.
!     <li><a href="https://man.openbsd.org/slaacd.8">slaacd(8)</a>:
! 	Written and maintained by Florian Obser.
! 	Imported March 18, 2017; released with OpenBSD 6.2.
!     <li><a href="https://man.openbsd.org/rad.8">rad(8)</a>:
! 	Written and maintained by Florian Obser.
! 	Imported July 10, 2018; released with OpenBSD 6.4.
!     <li><a href="https://man.openbsd.org/unwind.8">unwind(8)</a>:
! 	Written and maintained by Florian Obser.
! 	Imported January 23, 2019; released with OpenBSD 6.5.
!     <li><a href="https://man.openbsd.org/openrsync.1">openrsync(1)</a>:
! 	Written by Kristaps Dzonsons.
! 	Imported February 10, 2019; released with OpenBSD 6.5.
  </ul>
  
  <h3>Projects maintained by OpenBSD developers outside OpenBSD</h3>
  
  <ul>
!     <li><a href="http://www.sudo.ws/">sudo</a>:
! 	Started by Bob Coggeshall and Cliff Spencer around 1980.
! 	Imported November 18, 1999, first released with OpenBSD 2.7.
! 	Now maintained by Todd Miller.
!     <li><a href="http://bulabula.org/femail/">femail</a>:
! 	Written and maintained by Henning Brauer.
! 	Started in 2005, port available since September 22, 2005.
!     <li><a href="http://www.midish.org/">midish</a>:
! 	Written and maintained by Alexandre Ratchov.
! 	Started in 2003, port available since November 4, 2005.
!     <li><a href="https://github.com/nicm/fdm">fdm</a>:
! 	Written and maintained by Nicholas Marriott.
! 	Started in 2006, port available since January 18, 2007.
!     <li><a href="https://github.com/ajacoutot/toad/">toad</a>:
! 	Written and maintained by Antoine Jacoutot.
! 	Started in 2013, port available since October 8, 2013.
!     <li><a href="https://mandoc.bsd.lv/docbook2mdoc/">docbook2mdoc</a>:
! 	Started by Kristaps Dzonsons in 2014, maintained by Ingo Schwarze.
! 	Port available since April 3, 2014.
!     <li><a href="http://jasperla.github.io/portroach/">portroach</a>:
! 	Written and maintained by Jasper Lievisse Adriaanse,
! 	originally forked from FreeBSD's portscout.
! 	Started in 2014, port available since September 5, 2014.
!     <li><a href="https://github.com/yasuoka/cvs2gitdump">cvs2gitdump</a>:
! 	Written and maintained by YASUOKA Masahiko.
! 	Started in 2012, port available since August 1, 2016.
  </ul>