List of free games
Here’s a quick list of free full games I know of.
FPS
Warsow (http://www.warsow.net/)
OpenArena (http://www.openarena.ws/)
UrbanTerror (http://www.urbanterror.net/)
Quake Live (http://www.quakelive.com/)
Wolfenstein: Enemy Territory (http://www.splashdamage.com/wolfet)
Combat Arms (http://combatarms.nexon.net/)
RTS
Battle for Wesnoth (http://www.wesnoth.org/)
RPG
Maple Story (http://maplestory.nexon.net/)
Runescape (http://www.runescape.com/)
Music
FlashFlashRevolution (http://www.flashflashrevolution.com/)
Racing
TrackMania Nations Forever (http://www.trackmania.com/index.php?rub=nations)