Don’t you just love the open source community? That’s where Freeciv came from and now you get to play the complete full version for free. Freeciv is an empire building strategy game that was inspired by the history of human civilization. The goal of the game is to basically to lead your tribe from way back in the times of the stone age all the way to the future of the space age. You can download the game for either Mac, Linux, or PC.