WOW Addons
Official Forum about Addons
Link : 
http://forums.worldofwarcraft.com/board.html?forumId=11114&sid=1
wowui.incgamer.com Addons
Mods ; Most Popular ; Recently Added ; Most Downloaded Interface Bars ; Quest Mods ; Combat Assist ; Class Mods ; Death Knight Mods ; Druid Mods ; Hunter Mods ; Mage Mods ; Paladin Mods ; Priest Mods ; Rogue Mods ; Shaman Mods ; Warlock Mods ; Warrior Mods ; Map Additions ; Interface Addons ; Inventory/Item ; Collections/Packs ; Guild Packs ; Communication ; Professions ; Info Tracking ; Auction ; Guild ; Battlegrounds ; Raid/Instance ; Mod Development ; Plugins ; Others
Macros : General Macros ; Combat Macros ; Trade Macros ; Profession Macros ; Death Kight Macros ; Druid Macros ; Hunter Macros ; Mage Macros ; Paladin Macros ; Priest Macros ; Rogue Macros ; Shaman Macros ; Warlock Macros ; Warrior Macros ;
wow.curse.com Addons
Addons: Most Dowload Addons ; New Addons ; Highest Rated Addons
Curse Recommended Addons : Raids Addons ; PvP Addons ; PvE Grouping Addons ; Quests Addons
Class Addons: Death Knight ; Mage ; Rogue ; Druid ; Paladin ; Shaman ; Hunter ; Priest ; Warlock ; Warrior
Addons Categories ; Auction & Economy ; Boss Encounters ; Combat ; Map & Minimap ; PvP ; Unit Frames ; Others
arenajunkies.com Macros
General Macros ; DK Macros ; Druid Macros ; Hunter Macros ; Mage Macros ; Paladin Macros ; Priest Macros ; Rogue Macros ; Shaman Macros ; Warlock Macros ; Warrior Macros
wowinterface.com Addons
Featured Projects ; Beta-version Addons ; Libraries ; Compilations & Suites ; Stand-Alone Addons ; Developer Utilities ; Plug-Ins & Patches ; Wow Tools & Utilites ; Outdated Mods
Other Addons Site
WowReader : download and install (http://wow.allakhazam.com)
Wowmatrix : Download page (http://www.wowmatrix.com/addons/)
Wow Addons(www.thewowaddons.com) : wow map addons ; Wow Chat Addons ; wow raid addons ; wow pvp addons and so on
WOW UI : Addons ; map addons ; mods titan ; combat mods ; updated mods ; warlock mods ; shaman mods ; warrior mods ; interface ; mage mods ; priest mods ; rogue mods ; quest mods ; wow hacks ; ace mods ; macros ; paladin mods ; item mods