Vyatta software is a Linux-based, open-source networking (router, firewall, VPN) solution that leverages x86 hardware and components to deliver a flexible, affordable alternative to Cisco 1800 through 7200 series routers. Vyatta is a enterprise class, commercial open source offering with a staff of full-time engineers and support personnel.
IPFire is new-developed firewall build with the latest releases of linux 2.6 and tools. You are able to install a lot of addons and you will see a firewall can become a home server.