WowAce

Tells you if you're buffed

Healer gear benchmark

Collects, analyzes and presents information about the virtual economy.

ColaLight

Cartographer_nnTrainers

Stores a browsable database of spells that mobs cast

Inventory and bank organizer.

Allows you to browse your clients database

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

AceBuffGroups

Open those pesky lockboxes

TouristLib

Ingela's Rapture is a lightweight and highly configurable addon that gives you a cooldown bar for the internal cooldown of Ra...

Reminds you if your flask/elixir and/or Augmentation Rune and/orfood buff is about to expire or has expired

Keeps track of space left in your bags.

DHUD2

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

A library to help with localization of Archeology dig sites

Client for allowing the raid leader to gauge interest on items in a method similar to a ready-check.