WowAce

Test whether the player can really dispell a buff or debuff, given its talents.

FuBar_RaidBuffFu

ArenaPointer

View party member quest logs

One-click smart mounting.

A 'channeling spell'-tracking addon for Affliction Warlocks. Drain Soul, Drain Life/Harvest Life and Malefic Grasp.

Add a line to herb tooltips that shows what pigment they produce.

Does a /who search of multiple dungeons.

Handles the assignment, coordination, and announcement of many parts of the Lich King encounter in Icecrown Citadel.

T_Tracking

Swap a random tabard every time you visit the bank if you are wearing one

XArt

Prospecting and Disenchanting Aide

CombatAnnounce

Simple library that handles multiple levels of logging.

ActionCombat

Enables you to see Chinese, Japanese and other languages in game

Library to aid in the classification of Mounts

Detox

Shows current/dot cast haste values