1) Linux game 2) Windows game 
Nexuiz is a free first-person shooter video game developed and published by Alientrap. The game and its media are released under the GNU General Public License (GPL) and uses the DarkPlaces engine, a significantly modified Quake engine. A remake, also called Nexuiz has been released for Steam and Xbox 360 using CryEngine 3. Version 1.0 of the orig...