TripleA is a free open source turn based grand strategy game engine with play similar to Axis & Allies and Risk. Over a hundred different maps created by the community covering a wide variety of scenarios (such as WW1, WW2 and various science fiction and fantasy worlds) are available for download. TripleA supports single player vs AI, hot-seat, play by email and forum, direct online play, and a hosted lobby for live online play with other community members.