WowAce

LCDs for WoW

Splut

This is an add-on to block incoming guild/party/duel requests (except for friends/party/guild) (previously ASSBlock)

A Data Broker display for combat statistics.

oUF element for highlighting debuffs that are dispellable by the player

Raid loot system.

One Click Forced Exit / Logout / Reload UI button for Broker

FuBar_TimerFu

Does a /who search of multiple dungeons.

Adds a confirmation dialog when crafting Bind-On-Pickup trade skill items

Saves contents of your guild bank and sends/receives updates over the addon channel

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

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

Displays a grid of guild ranks versus permissions.

SmartQueue

Cartographer_Noteshare

GetInLine

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

StatStain

Allows you to prevent addons from sending and receiving messages.