I'm surprised I forgot these two.
Star Frontiers is alive and well at Starfrontiers.org. Then we have Starfrontiersman being added to the Resources list.
I also forgot Talislanta. No friggin elves!
Edit: I also forgot ZEFRS - the engine behind the old Marvel Superheroes Game, Conan and Gamma World 3rd Ed, all by TSR.
Succubus Sunday - Source
11 minutes ago