WowAce

Compact & customizable filtering, monitoring and grouping of buffs and debuffs

Personal buff monitor - are you buff enough?

FuBar_HonorFu

Displays classes and specialisation dependent stat priorities provided by icy-veins.com

Shows simple Buttons for your Cooldowns :)

Open all your mail

Adds a button to undress the model in the Dressing room.

Adds predicted lists for spells while the user types

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

MorgDKP

Gathers statistics on certain chance-on-use spells, also known as procs.

Adds unreal tournament style sounds to PvP encounters.

Shows skills in a tooltip and allows them to be used.

KoS-Management Tool

Display aura information inside action buttons

Show what quests have changed

Cartographer_QuestObjectives

Litmus

Library handling communcation for Magic* addons

Priority 3 loot announce addon