WowAce

Allows the user to customize the the tooltip with lua-scripts

SupplyAndDemand

SurgeonGeneral Listen CLient

pMutilate

Monitors the combatlog identifying players from the oposite faction near you.

Sets you to DND when you fight a boss, and some other crap.

Warns you with sounds when you gain different shaman spells.

First Aid data for Ackis Recipe List.

FuBar_RegenFu

Shows the spec of people around you in the tooltip.

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Hunter 'Misdirection' activity and cooldown monitoring for raids/groups. 'Readiness' aware.

Powerleveling guide framework

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

Displays bars depending on your professions

Adds predicted lists for spells while the user types

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

FuBar_PetInFu

Fancy up the PlayerPowerBarAlt frame

A jukebox for playing wow embedded music.