Online Tank Battle Game, supports Windows and Linux at the same time.

Zero Ballistics is a multiplayer online tank battle game discovered today. It's 3D and cross-platform, playable on both Windows and Linux. The controls are simple: use WASD for movement, left click to fire the cannon, and right click for the machine gun. The gameplay is quite intense. For the deathmatch mode, you just need to find a host on the internet and join.