WowAce

Fancy up the PlayerPowerBarAlt frame

Dynamic item DKP calculation

XArt

adds navigation buttons to Encounter Journal

Provides a quick display for the LFG Call to Arms

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

Display bag usage on each of your bag slots.

Automates bites during the Blood-Queen Lana'thel encounter in Icecrown Citadel

Check the quality of wild battle pets

Adds a button to the quest completion interface which allows you to auto equips selected quest Item after completion

Save and send chat messages to many channels. Allows quick item and profession linking within your messages.

Allows for easy congratulating when someone earns an achievement.

VitalWatch

A data broker display, that shows one block per plugin.

Hides MicroButton Alerts

Helps you automate selling stuff.

Allows you to preview weapon glow in Dressing Room.

Bind spells, items, and macros to keys, without using action buttons

AspectsBar

Toggles WoW to the forground on events.