OpenBSD/armish runs on various ARM-based appliances, using the Redboot boot loader (and which boot Linux by default).
A mailing list for ARM-based ports is available at arm@openbsd.org. To join the OpenBSD/arm mailing list, send a message body of "subscribe arm" to majordomo@openbsd.org. Please be sure to check our mailing list policy before subscribing.
The current port maintainer is Dale Rahn (drahn@openbsd.org).
OpenBSD/armish is the 3rd OpenBSD port to ARM based machines, after cats and zaurus. It was started by Dale Rahn on the Certance CP3100. Thecus N2100 and IO Data HDL-G support where finished first though.
Developement is currently pretty active. Thecus boots from the network (using TFTP or HTTP, thanks to redboot) and runs multi-user.
Client-side X applications and libraries are available.
Snapshots are made available from time to time, in this location as well as in a few mirrors. Here are the OpenBSD/armish snapshot installation instructions as well.