At the moment Soldat is the most popular online game around
The sequal to stick soldiers
A crazy fusion between Lemmings and DragonBall Z
Need a quick Dragonball Z fix?
Wolfenstein: Enemy Territory is a Multiplayer Online First Person Shooter which sports some of the best graphics for a freeware first person shooter.
Alien Swarm is a shmup played with an overhead view where the player can chose to play one out of four Marine classes; the Tech, the Medic, the Officer, and the Special Weapons.