LinksHappy Fun EvileFortress departures
Quake Related
Inside3D (Tutorials, Forums, in short, where you should ask if you want to know about QuakeC)
PlanetQuake (Should be obvious by now...)
Quakesrc (Engine Modding forum.)
QuakeDev (Where this place is hosted)
Quaddicted (Excellent place to get maps, etc.)
Other links