Check licence and sourceavaliability of the games from the following 
sites and if possible implement them:

http://astrobattle.com/
http://botsnscouts.sourceforge.net/index.php3
http://wouter.fov120.com/cube/
http://d1x.warpcore.org/
http://icculus.org/d2x/
http://www.scorpioncity.com/djgame.html
http://dossizola.sourceforge.net/
http://egoboo.sourceforge.net/
http://epiar.net/
http://www.nongnu.org/feuerkraft/
http://www.geocities.com/~elan_feingold/Software.html
http://www.movement.uklinux.net/fscktris/fscktris.html
http://gccg.cjb.net/
http://icculus.org/freespace2/index.php
http://www.floot.demon.co.uk/lincity.html
http://www.linux-games.com/castle-combat/
http://www.majik3d.org/
http://mantigua.sourceforge.net/
http://www.hut.fi/~jtpelto2/nethack.html
http://www.head-crash.com/orbit/index.html
http://openparsec.sourceforge.net/
http://www.planeshift.it/
http://www.pygame.org/shredwheat/solarwolf/
http://redpixel.sourceforge.net/redpixel.html
http://reaper3d.sourceforge.net/
http://www.lynxlabs.com/phobiaIII/index.html
http://robotournament.sourceforge.net/
http://www.scummvm.org/
http://sixdays.sourceforge.net/index2.phtml
http://slashem.cjb.net/
http://starshiptraders.com/
http://www.methane.fsnet.co.uk/
http://loser.sourceforge.net/
http://www.planetblood.com/qblood/
http://tuxaqfh.sourceforge.net/
http://uwadv.sourceforge.net/
http://universe.sourceforge.net/
http://vegastrike.sourceforge.net/
http://wod.sourceforge.net/
http://www.xevil.com/
http://page.inf.fu-berlin.de/~mkrueger/xcrillion/
http://xpired.sourceforge.net/
http://possibleworlds.cjb.net/
http://www.racer.nl/

08:37PM <tcr> kasc: Let me describe a possible end situation (that I'd really like): Having a
        bootable CD (or more) which boot smoothly, and there's a graphical login where you can
        choose between all games available on CD (cool would be with description and
        screenshot). Savegames etc. can be stored at a floppy...