Xonotic

Xonotic is a fork of the GPL-ed first person shooter Nexuiz. The fork was initiated after a controversy over the licensing of Nexuiz to Illfonic game studios in order to create a console version.

Xonotic announced that it would diverge from Nexuiz in the following ways:
 * A more unified and consistent art direction
 * New player models and animations
 * New set of default maps, some of them will get a makeover
 * New sounds and music
 * New stronger bot AI
 * Low quality textures will be dropped and replaced with higher quality ones
 * Some weapon models may be changed
 * More frequent releases
 * Global player stats tracking system, supporting anonymous player as well
 * New HUD

The game was released initially in 2011, with the latest release 0.8.2 coming out in April 2017.