Tremulous

Tremulous 1.1.0 is a First Person Shooter game with elements of an RTS.
In this game, the player can choose to fight for the aliens or the humans.

Playing as a human, players are rewarded with credits for each alien kill. These credits may be used to purchase new weapons and upgrades from the "Armoury". Upon killing a human foe, the alien is able to evolve into a new class. The more kills gained the more powerful the classes available.

The final object of the game to eliminate the opposing team. This is achieved by not only killing the opposing players but also removing their ability to respawn by destroying their spawn structures.

You can play the game online, joining one of the many Internet servers available, you can create your own server or play alone.

You can choose to play in several worlds, each one with its own map, characters, difficulty and opponents. You will move your character using the arrow keys and the mouse.