WowAce

Shows mana usage as a percentage in a spells tooltip.

LDB data source for currency flow

Collect data about you myth+ challenges

Displays online guild mates.

Tools for MultiBoxers or Group questing/leveling

Enhancer

Load manager for AddOns

ItemSync the happy item gatherer and toolkit.

Tracks the current Fear Ward's in the raid or party.

Searches bags/banks of all your characters/guilds.

Adds party/raid role icons in useful places

A library to provide a clean dropdown menu interface.

eeShards

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

Display Garrison missons for all Characters

Nihilum Raid Tracker, originally written for the EU guild Nihilum.

Rebuff yourself with the mousewheel.

Insanity resource tracker for shadow priests.

ClosetGnome_Switcher

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.