m0n0wall
"a project aimed at creating a complete, embedded firewall software package that, when used together with an embedded PC, provides all the important features of commercial firewall boxes (including ease of use) at a fraction of the price (free software)"
http://m0n0.ch/wall/
m0n0wall Firewall V1.0 - review by David Cook (99 visits)
http://www.tomsnetworking.com/Reviews-161-ProdID-MONOWALL.php
m0n0wall Firewall V1.0 - Part 2 - review by David Cook (104 visits)
http://www.tomsnetworking.com/Reviews-162-ProdID-MONOWALL2.php
m0n0wall Handbook - (126 visits)
http://doc.m0n0.ch/handbook-single/