WowAce

Assist you with faction transfers letting you know which mounts, spells, etc you have and what they will be swapped to.

Stitch-1.1

Simple language selection for Data Broker

Advanced Chat Filtering and Spam Blocking Addon

Handles the assignment, coordination, and announcement of many parts of the Lich King encounter in Icecrown Citadel.

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

Manages the scanning of the auction house in a reliable an efficient manner.

A boss encounter engine used by other add-ons

Customizing your buff display

This addon helps with daily quests.

FuBar_NetStatsFu

Show a rough range indicator

Shows a money overview for your current realm in the tooltip on the money in your bags

Percent

View all your Auctions on any DataBroker display.

Enables cooldown notification between players and allows party members access to each-others spell books.

Go quick, or go home!

Adds resurrection, resurrected and soulstone status to Grid2. Uses LibResComm-1.0

A 'channeling spell'-tracking addon for Affliction Warlocks. Drain Soul, Drain Life/Harvest Life and Malefic Grasp.

BuffProtectorGnome