WowAce

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

Quest information

FuBar_ToFu

Create reagents easily

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

GearRating

Manager for DKP points. Requires DKP - Bidder as main Graphic User Interface.

Keeps tracks of /rolls.

Drops the least valuable item in your bags to make space.

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

Adds an Atlas button to FuBar.

Sanity2

Keeps track of time played and rested XP across your characters.

DynRepBar

Quixote

AnchorsAway

Adds filters for Legion items to AdiBags

FuBar_MonkeyQuestFu

Test whether the player can really dispell a buff or debuff, given its talents.

Sneakily inspect how much gold your mouseover target has made so far.