Battle Tanks is a funny battle on your desk, where you can choose one of
three vehicles and eliminate your enemy using the whole arsenal of weapons.
It has original cartoon-like graphics and cool music, its fun and dynamic,
it has several network modes for deathmatch and cooperative -- what else is
needed to have some fun with your friends?  And all is packed and ready for
you in Battle Tanks.  Features include:

    - Multiplayer
    - Cross-platform
    - Free distribution and open source
    - Old-school oriented

WWW: http://btanks.sourceforge.net/