WowAce

Auto equip/take off a selected tabard on entering/leaving an instance.

CombatAnnounce

Social tracking suite.

Drops the least valuable item in your bags to make space.

Shows the group leader, raid assistants, and master looter in Grid.

RangeRecolor

User-configurable protection for your inventory. Automatically buys back mistakenly sold items.

Paparazzi

Fixes strata bugs in UI windows

LCDs for WoW

Reverse Engineering will drill down and search your tradeskills for their elements

Library for tracking cooldowns of other players

Keeps track of honor, PvP statistics, BG Marks, and Arena points.

Surfaces

View party member quest logs

Battle.net point query addon in Chinese realms(中国国服战网点插件)

FuBar_RLAssistFu

Reports the total threat on a mob at the end of combat.

Synchronise friends among your characters

FuBar_VolumeFu