the id tech 3 engine. Ur-Quan Masters, The 2002 2007 sci-fi Action RPG GPL Open Source port of Star Control II based on the GPL-released 3DO source code. Vega Strike 2008 2008 Space Sim GPL GPL Elite clone. Warsow 2005 2009 FPS GPL Proprietary Warzone 2100 1999 2009 RTS GPL GPL