0 A.D. is an open source game, meaning a FREE game. It’s very much like Age of Empire and it’s still in early development but is perfect for people that like old school RTS games. It support multiplayer at the moment but you can play some skirmish mission as well. The music is also very nice to lisen to and we recommend to give it a try since it’s FREE. Did we say it’s free? Yep you can get it there.