WowAce

Runs pool-fishing contests

Colors friends/bg score board/who list names by class color

With Mists of Pandaria Blizzard publish all characters from an account unless you disable that 'feature'. This addon warns you.

Tells you which nest to fly to

LibCustomAchievement-1.0

Checks on entering combat whether or not the entire raid has only blue gear equipped

Removes HP buffs when reaching phase 3 during the Anub'arak encounter

Add AVR lines for the BloodQueen Addon's Bites

Guide Handler UI.

Displays an estimated swing timer for monsters

GBS tricks other addons into thinking a guild bank is your personal bank.

Shows how many of an item a party member has crafted

RareCaller

Add rare locations into GatherMate2.

Saves your watched quests and achivement between sessions

Resolve module for Broker displays.

A helper addon for the achievement "Shake Your Bunny-Maker"

Know what Daily-Quests are available today!

An addon to keep track of your earned artifact power and present you relevant information.

Suppresses guild reputation cap spam when turning in quests.