I found this really cool game called tremulous a few months ago while I was on youtube. Tremulous is kind of a rts/fps game. There are 2 teams, aliens and humans. Each team has different classes, like the fighter and builder for humans, and the dretch and granger for the aliens. As a human, you can build turrets, build spawns, and a crapload of other things. Aliens can build acid spitter(Turret), and eggs (spawn). You basicly destroy the enemy's vital part of their base, the computer something, or the overmind. The aliens are all different, varying from the headcrab-ish dretch, to the giant monster tyrant. Nobody plays anymore, and that bothers me. This is an epic free game for windows, mac, and linux. Google Tremulous if you want to get the game.
