Superpowers is a board game similar to the classic game of Risk only with more of everything! In this game you have infantry, tanks, submarines, bombers plus many other modern day war units. Also players can make alliances with other players, working out strategies and coordinating their attacks.
Superpowers Online is a free version of the board game that you can play against other people. The games are multiplayer, but you don't have to be online at the same time. Simply take your turn whever you want, and then check back later in the day or next day to see how the game is progressing.