Freeciv is a free turn-based multiplayer strategy game, in which each player becomes the leader of a civilization, fighting to obtain the ultimate goal: To become the greatest civilization.
Gameplay features and specifics:
If you're thinking that "ohh my gosh, I found a free civs" well you'd be right kind of. ITs pretty good its like a civs 1.5 but some of the controls are a little messed up but the overall quality of this app is fine. But like Yusuf said freeciv-web.org is a lot better and is unblocked by linwise and Aristotle. This is a solid 3-4 out of ten.
Actually runs pretty well, while also looking nice. However, if you want to play freeciv online I recommend just playing one of the mirrors of freeciv-web. Other than that it's Civ 2 but you can play as the Hacker nation led by Richard Stallman so 10/10 right there.