WowAce

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

Displays info about who rolled Need/Greed/Pass on items that are currently rolled for

Adds an Atlas button to FuBar.

Dedicated to Lazybones of EU Khadgar who had the original idea as he can't find a damn thing in his bags. You're a great guy...

Enable/Disable addons for your character in game

Adds item values to chat messages.

A fully featured library tracking all ongoing absorb effects

FuBar_SWStats2Fu

Lets you drag UI frames around

Death reports

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

Lists Pots and Herbs you got on all chars and allows you to specify color coding

On login, displays changes to your guild since the last time you logged in.

FuBar_FuXPFu

ItemEnchantApplication

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

A Data Broker add-on for quickly switching your specialization with gear set and loot specialization.

Draws some lovely 3D portraits in the standard Blizzard artwork.

Fancy up the ExtraActionButton frame

Does a /who search of multiple dungeons.