Hey guys, if you know any good and free games (like.. actual full games, not flash games) post 'em here. I'll go first.
Alien Swarm- Free, downloaded through Steam. Runs on the same engine as Left 4 Dead, and can be described as a 3rd person version (somewhat flat, but pretty modern graphics) of Left 4 Dead, except with Aliens instead of zombies. Pretty much Multiplayer only (online/lan).