fast-paced 3D first-person shooter

 OpenArena is an open-source content package for ioQuake3 licensed under the
 GPL, effectively creating a free stand-alone game. Though OpenArena is a free
 replacement for id Software Inc.'s Quake 3 Arena, it is NOT compatible with
 the proprietary game!
 .
 OpenArena might be considered unsuitable for children.
 .
 This package installs the OpenArena client.