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Modding Links
From Quake Wiki
TODO: add all the sites I don't know about and link a bunch of cvs repos for mods/engine dev
func_msgboard - mapping focus, many tools released here, run by metlslime
InsideQC - forum for quakec modders, large collection of tutorials
QuakeOne - another modding forum, quite active, has graphics and engine modding focus
QW-DEV - hosts multiple quake and quakeworld projects