insomniac17 on 14 June 2012
If you like RTS games, 0 A.D. is a completely free game (as in you will never pay anything for any part of the game) that's sort of like Age of Empires 2. It's in Alpha right now, but it's playable and pretty enjoyable. They're releasing new updates (usually with new civilizations and tech) every few months or so.
