WowAce

Library supporting plug in filters.

Fancy up the ExtraActionButton frame

Cryolysis

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

Displays a variety of useful stats for tanking

Makes the Blizzard options frame movable and resizable

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

Displays online friends.

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

rSelfCast

Manages the SavedVariables of your addon with a layered hierarchy of settings.

Dailies Quest Tracker

Adds 3 indicators to each side (top, bottom, left and right).

Fancy up the PlayerPowerBarAlt frame

opens/closes all bags when at merchant (instead of only the backpack)

Fixes UI bugs

FuBar_MiniClockFu

ImprovedTargetFrame

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

Objective Tracker