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Some great Quake 1, 2, and 3 map and mod sites:
Quake 1 Maps: (Not really a site, but contains almost every Q1 map made in a zip file:
http://quakeone.com/forums/quake-mod-releases/finished-works/5154-definitive-frikbot-waypack.html
Quake 1 Mods: http://www.gamers.org/pub/idgames2/
Quake 2: Maps: http://www.deaconstomb.org/pub/ <---- Over 6000 Quake 2 Maps, and counting!
Quake 3 Maps: http://q3a.ath.cx/ <----- Very well organized Q3 site, with LOADS of maps including the Simpsons one.
Quake 1 Maps: (Not really a site, but contains almost every Q1 map made in a zip file:
http://quakeone.com/forums/quake-mod-releases/finished-works/5154-definitive-frikbot-waypack.html
Quake 1 Mods: http://www.gamers.org/pub/idgames2/
Quake 2: Maps: http://www.deaconstomb.org/pub/ <---- Over 6000 Quake 2 Maps, and counting!
Quake 3 Maps: http://q3a.ath.cx/ <----- Very well organized Q3 site, with LOADS of maps including the Simpsons one.