WowAce

Show a rough range indicator

Makes tracking reputation much simpler. By InSo(v)nIaX

Allows for easy congratulating when someone earns an achievement.

Allows combined aura detection. motw + gotw, all 4 mage int buffs, etc. in one status.

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

AbacusLib

Displays bars depending on your professions

Display an arrow that points to a raid/party member anchored to raid frames

Vengeance module for Broker displays.

Adds pipes which can control arbitary other statuses (like toggle status on key or "in combat"-state).

Collects, analyzes and presents information about the virtual economy.

Makes grid QuickHealth aware

aX_RaidStatus

SurgeonGeneral Listen CLient

Library to provide non-explicit cooldown tracking and callbacks.

Ignore more than 49 people, autoshared between your alts

SwapMagic

Buffalo2

GearRating

HazLoot