Here's a free RPG that a friend and I originally wrote over 31 years ago. This version has been updated to include "modern" game features like an abusive license and a bunch of new settings to play it in!
I've been playing D&D since the original game came out. In the OD&D section I've posted some of my stuff from years past. There's an old character sheet from the early days, my house rules, and character sheets for various classes.
I've also enjoyed playing Traveller since it came out in 1977. My family and I playtested the new rules from Mongoose Publishing. We play a game that is a mix of Mongoose Traveller (MGT) and "Classic Traveller" (CT). Among the wonderful resources I employ for our game are the wonderful Classic Traveller and JTAS CD-ROMs available from Traveller's original designer, Marc Miller, through Far Future Enterprises.
I'm also a beta tester for Traveller 5.
I'm running a Traveller campaign now, and will soon be adding a full Traveller section to this site.
Need orbital period tables for your Traveller game in the meanwhile?
My Pathfinder Section
The new Pathfinder RPG is my favorite of the d20 rule sets that I've seen so far. I expect something about it will show up here in time.
While PFRPG is still far short of "rules light", it's the smoothest of the d20 systems I've seen, and the class definitions go a long way toward fixing the problems I've seen with the system since it came out with D&D 3.0. (Dead end fighters, useless "rogues", etc.)
See my blogged review of the game.
I've recently finished running a Pathfinder campaign. Once my players have had a chance to look them over, I'll be posting some of my GM notes here. All together, they are very long, so they'll be edited down.