UNIX for Macintosh
Includes information on NetBSD/mac68k (BSD being another form of UNIX). The latest release is can be downloaded from this page.
Advanced RISC Computing Specification (PDF)
(Version 1.2)The Advanced RISC Computing Specification (ARC Spec) defines the architecture for an industry standard computing platform based on the MIPS family of microprocessors.
NetBSD Project Web site
NetBSD is developed and supported by a large and vivid international community. The full system sources are freely available under a liberal licence.
The History of the NetBSD Project
NetBSD took its roots from the original UCB 4.3BSD via the Networking/2 release and 386BSD. The NetBSD project was founded by Chris Demetriou, Theo de Raadt, Adam Glass and Charles M. Hannum.