SWAT HQ
Free Tabletop Game Systems
The FUDGE Guide Archive
http://www.fudgerpg.info/guide/Guide/WebHome.html
Free Wargames Rules
http://www.freewargamesrules.co.uk
Game-it-Yourself!
http://www.runestoneit.com/~dseagraves/index.html
John H. Kim's Free RPGs on the Web
http://www.darkshire.net/jhkim/rpg/freerpgs