OpenBSD follows in the footsteps of 4.4BSD by supporting the hp300; most types of machine are supported with 68020 or better processors, along with SCSI and HPIB storage devices.
OpenBSD/hp300 runs 8k pagesize executables natively (the first operating system for the hp300 to do so), maintaining the standard binary format used by all other OpenBSD m68k platforms.
Snapshots are made available from time to time.
The maintainer of the hp300 port is Jason Downs, <downsj@openbsd.org>.
www@openbsd.org