Liquid War is a truly original multiplayer wargame.
You have to control an army formed with thousands of pixels which look like liquid, and try and eat your opponent.
Up to 6 people can play on a single machine, but internet play is also possible.

License: free

Additional System Requirements: You need Allegro 4.2 if you want to compile the game. Allegro is available at: http://www.talula.demon.co.uk/allegro/