FreeBSD
 - The FreeBSD Project is dedicated to providing a commercial quality networking and desktop OS solution, at this time focused specifically on taking maximum advantage of Intel x86 (PC) architecture machines.  
Linux ARM
 - ARM Linux is a port of the PC version of Linux. 
Linux x86
 -    Linux x86 (Site #2)
Linux/68k
Linux/PowerPC
 - Linux for PowerPC computers- PowerMacs & PReP (BeBox,RS6ks,PowerStack,etc) 
NetBSD
 -    NetBSD (Site #2)
 -  NetBSD (Site #3)
 -  NetBSD (Site #4)
 -  NetBSD (Site #5)
OpenBSD
 - The OpenBSD project involves continuing development of a multiplatform 4.4BSD-based Unix-like operating system.