LibreQuake aims to create a completely free Quake alternative compatible with mods
www.gamingonlinux.com
In a similar spirit to Freedoom, for Quake fans perhaps you'll want to take a look at LibreQuake, which aims to do a similar thing to allow you to play Quake content with completely open source software.

On en avait déjà parlé, ici on est en avance sur la couverture des nouveautés. ;)