FPS (first person shooters)
Xonotic 3D game type arena shooter direct successor of Nexuiz.
After termination of the development of Nexuiz, as FOSS game, Xonotic is the 'salvation' for hundreds of thousands of fans.
All the favorite things of Nexuiz are present in Xonotic, as many more good things are promised by the developers.
Look at the project site and download the latest version, which is just under a gigabyte.