WowAce

Enable/Disable addons for your character in game

A library for PvP and Battlegrounds

Friends & Guild Data Broker plugin.

ItemSync the happy item gatherer and toolkit.

Adds four icon indicators to Grid (top, bottom, left and right).

Prospecting and Disenchanting Aide

Provide plenty of links

Simple display and management of Away / AFK / Busy / DND status via broker or minimap

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

Allow rule based automatic rolling on loot.

Heads Up Display with Player and Target Info

Pet Theory

eePanels

A PitBull4 module which shows an arrow that points to raid members

FuBar_ButtonSmashFu

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

An auction house AddOn to make the life of each fence easier.

A threat main view module for Recount

MAcon

Combat log evolved.