WowAce

Tracks the HoTs you cast.

Incubator

OneBag is a replacement for the default game bags that combines all the bags into one frame.

Onyx skins for Masque.

tracks and share quests between your party

Display aura information inside action buttons

Alternate Power- and Combopoint/SoulShard/HolyPower-bar

Raid Frames using the oUF framework.

Babble-2.2

Auto repair + shows durability.

Redirect character errors, system messages and information messages.

Questing minion

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

Collects Herbs, Mines, Gas Clouds and Fishing locations and adds them to the worldmap and minimap

Sells all junk in your inventory at once.

Adds a status to Grid for debuffs applied by Raid Bosses.

Displays the remaing cooldown of the action you tried to use

Create panels for customizing your UI, sucessor to eePanels

Co-ordinated targetless Party and Raid wipe recovery. Evolved

Configurable Castbars