WowAce

Mirror

Shows more recipies in the profession window.

Paints your known blueprints red.

SpoilsOfWar

Keeps an eye on someone's distance from you, and alerts you if they get too far.

Save and send chat messages to many channels. Allows quick item and profession linking within your messages.

Gives equipped and overall iLvl to indicate the quality of a character's gear.

Adds AFK status to Grid frames.

Send Mail to Groups

LD50_armor

A library to provide a way to easily create controls for Blizzard's options system

A library which provide tools for detecting adverse effects on units.

Raid assignments planner

LibRockLocale-1.0

A helper addon for the achievements "Let It Snow", "Fistful of Love", "Shake Your Bunny-Maker", "Check Your Head", and "Turkey Lurkey"

T_Tracking

A Fail main view module for Recount

Counts stacked lifeblooms and uses progressive colors to indicate the active number of HOTs.

Automatically accepts and turns in the Holiday "fly around the world" quests.

Adanced Achievement Tracker is a smal tool to track Achievements