argonium : Multiplayer FPS powered by iD Software's Quake 2 engine ( http://www.planetquake.com/td/argonium/ )
doomsday : A modern gaming engine for Doom, Heretic, and Hexen ( http://www.dengine.net/ )
duke3d-data : Duke Nukem 3D data files ( http://www.3drealms.com/ )
eduke32 : Port of Duke Nukem 3D for SDL ( http://www.eduke32.com/ http://hrp.duke4.net/ )
freedoom : Freedoom - Open Source Doom resources ( http://www.nongnu.org/freedoom/ )
openarena : Open-source replacement for Quake 3 Arena ( http://openarena.ws/ )
sauerbraten : Cube 2: Sauerbraten is an open source game engine (Cube 2) with freeware game data (Sauerbraten) ( http://sauerbraten.org/ )
tremulous : Team-based aliens vs humans FPS with buildable structures ( http://tremulous.net/ http://trem-servers.com )
unvanquished : Daemon engine, a fork of OpenWolf which powers the game Unvanquished ( http://unvanquished.net/ )
unvanquished-data : Datafiles and maps for unvanquished ( http://unvanquished.net/ )
urbanterror : Hollywood tactical shooter based on the ioquake3 engine ( http://www.urbanterror.info/home/ )
warsow : Multiplayer FPS based on the QFusion engine (evolved from Quake 2) ( http://www.warsow.net/ )
xonotic : Fork of Nexuiz, Deathmatch FPS based on DarkPlaces, an advanced Quake 1 engine ( http://www.xonotic.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a games-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/games-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org