WowAce

XRS

Displays Instance Maps

Tracks the HoTs you cast.

Inspects all members of raid and saves in database, as well as lists people's dkp values

Add-on that allows you to setup and quickly switch between different profiles of your action bars

KoS-Management Tool

Babble-2.2

Highly-configurable shield / absorb tracker.

Display aura information inside action buttons

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

Checks your gear before bosses and yells at you if you're an idiot

Smart raid loot and DKP tracker with automated standby and learning

Keeps track of performance of memory, latency, and framerate.

Adds your name to chat messages

PT3Browser

Show what quests have changed

Tracks, transmits and displays the cooldowns of your raid.

View an image of your guild vault from anywhere.

Provides quick access to information on your group and their equipment, enchant and gem choices.

Antagonist