5 Best Linux/BSD Firewalls

Over the course of recent years, some people have found the quality of most out-of-the-store firewall appliances either lacking functionality or worse, set at a price that has made them generally out of reach. Because of this issue, I thought it would be beneficial to write an article to better highlight what works and what does not with regard to turning an older PC into a standalone router/firewall appliance. The article covers in brief the following:

IPCop
pfSense
M0n0wall
SmoothWall
Linux LiveCD Router