WowAce

SacredBuff

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Outdated! Please use 'XLoot', available on Curse and WoWI

Inventory and bank organizer.

A simple interface for unitframe click casting.

QuestAnnouncer

Resizes some default UI frames (GuildUI, LootFrame, RaidInfo, TradeSkillUI and TrainerUI) to show more lines

Wardrobe2

Enhancer

Library to help with querying unit talents.

Make it easy to explain bosses in Raids.

Prospecting and Disenchanting Aide

Bind spells, items, and macros to keys, without using action buttons

A filter tool for blizzards TradeSkillUI

Adds the toon name to the alert that your RealID friend has come online.

Allows you to prevent addons from sending and receiving messages.

A library for PvP and Battlegrounds

Filters AFK and DND messages after you've seen them once.

Babble-2.2

An addon to assist with organizing healing in a raid set up.