Endian Firewall Community is a "turn-key" linux security distribution that turns every system into a full featured security appliance. The software has been designed with "usability in mind" and is very easy to install, use and manage, without losing its flexibility.

http://www.endian.com/en/community/about/overview/

Vyatta software combines the features, performance and reliability of an enterprise-class router, firewall and VPN with the cost savings and flexibility of open-source solutions. By leveraging the performance and economics of the x86 hardware ecosystem, Vyatta solutions enable customers to grow their networks on a vastly more efficient cost curve and deliver twice the routing performance at half the price of proprietary vendor solutions.

http://vyatta.com/products/software.php