alien shooter

Alien Shooter

 2 - Conscription
Demo   
230

Stop the invasion of the planet and finish with a complete army of aliens.

tremulous

Tremulous

 1.1.0
Free (Open Source)   
1

Prevent your enemies from regenerating and you complicating your victory.

nexuiz

Nexuiz

 2.5.2
Free (Open Source)   
1

Enjoy a good time with a game of intensity and permanent action

x force fight destiny
Free (Open Source)   

This is a game in which you will face aliens, either in space or on Earth.

alien blaster

Alien Blaster

 1.1.0
Free (Open Source)   

A shoot 'em up game. Destroy alien ships.