Relatives of Multics
Solaris links OpenBSD info Just for Fun Tyler's stuff

Linux links
Linux firewall tools: Page provides "fill in the blanks" firewall rule set configuration.
Linux boot floppy router: Turn those old PCs into linux routers with just one floppy.
RedHat Firewall Documents: Firewall docs for redhat linux.
Rpmfind : Find linux rpm software packages.