www.openbsd.org can repalce all cisco routers, and since once it running it on a modern 4 core cpu will run fast as hell compard to cheap ass cisco hardware.
Most free unixes can as well but openbsd is really really good esp with openBGP

so companies that are obsolete:
microsoft
cisco
oracle

I am trying this on an archlinux pc with icewm desktop.
p4 1700 with 1500m ram and it runs faster than most quad core winodws 7 pc
I use opera browser, pidgin chat, and vlc movie player

oh an flash and youtube work fine
www.archlinux.org