Open source remakes of games you're still loving
Some FPS additions:<p>AlienArena - like UT, Q3A. Graphically impressive, seems to be actively developed.<p><a href="http://red.planetarena.org/" rel="nofollow">http://red.planetarena.org/</a><p>Nexuiz - like UT, Q3A.  Also decent graphics, seems devs are working on a commercial sequel now, so the last major version was in 2009.<p><a href="http://sourceforge.net/projects/nexuiz/" rel="nofollow">http://sourceforge.net/projects/nexuiz/</a><p>OpenArena - like Q3A. Seems to be an attempt to recreate Quake 3 Team Arena from the GPL source with new content, some graphical improvements.<p><a href="http://www.openarena.ws/" rel="nofollow">http://www.openarena.ws/</a><p>Tremulous - like Gloom, Natural Selection etc.  Sci-fi FPS/RTS hybrid.<p><a href="http://tremulous.net/" rel="nofollow">http://tremulous.net/</a><p>Urban Terror - like Counter-Strike, but a little more arcade-style.<p>EDIT: free but not yet open source<p><a href="http://www.urbanterror.info/" rel="nofollow">http://www.urbanterror.info/</a>