WowAce

FuBar_CraftTimersFu

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

Checklist and notes addon.

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

Meeuuuh

TwiCo

Library providing mouse-click support for LibQTip-1.0.

Toggle Windowed Mode with click or keybind.

Adds notes to item tooltips

Adds indicators to the sides of Grid frames.

Debuff Monitor: A Powerful & Configurable Raiding Tool

Used to visualize and change values of variables/variable-trees in game

Embeddable library to track raid/party roster

Records mail when visiting the mailbox to make keeping track of mail and expiration dates easy.

Lets you drag UI frames around

Shows an arrow to your bite victim during the Blood-Queen Lana'thel encounter in Icecrown Citadel (your raid leader must be r...

Restores channels and channel-window associations after disconnects remove them.

FuBar_WhisperFu

BanzaiLib

Adds Name and Buyout Price sort columns to the auction house.