WowAce

FuBar_switcherFu

A simple addon that warns you if your pet isn't attacking while you're in combat.

BuffMe

iTargetingFrames

Light-weight enhanced casting bars

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter

LDB broker for group interrupts

Complain about crowd control breaks.

Keeps track of healing spells cast by everyone in a group.

Kenzo is a skin for Masque

FuBar_NinjutFu

Shows learned recipes of all characters.

Spyglass

TalentShow-1.0

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

Monitors for friendly deaths and announces them as in Myth: The Fallen Lords

Displays an animated bar with next enemy swings

Keeps tracks of /rolls.

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

Fires events whenever a raid member "fails".