#1 WoW FREE Addon Download Webpage... WoW.Curse.Com
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Now for the rest of these i have never used, and probably wouldnt recommend anything other then wow.curse.com...

#2 files.wowace.com/
#3 wowui.worldofwar.net/
#4 wow" target="_blank">www.wowmatrix.com
#5 wowinterface.com
#6 Deadly Boss Mods :: A World of Warcraft AddOn
#7 Cosmos UI for World of Warcraft


and pritty much thats it...