WowAce

Displays online friends.

Shows your standings with the factions.

Helps you keep track of your experience.

Mutes various chat related annoyances while in capital cities and instances.

Changes the look of the default UI

Show what quests have changed

Allows you to view all items from all your characters on the same account, when-ever and where-ever you want.

Makes the default frames moveable via simple drag and drop

Barks at you when you target a crowd-controlled unit

In World of Warcraft healers have to die. This is a cruel truth that you're taught very early in the game. This add-on helps you influence this unfortunate destiny in a way or another depending on the healer's side...

an embeddable library providing an abstraction layer for tracking and querying Blizzard's Nameplate frames with ease and effi...

Manages social information with a focus on main-alt associations.

Set and manage character notes that are displayed in unit tooltips and /who results.

Automatically turns on the combat log for selected instances

Food/water macro generator

Scan for rare mobs so you can find them and their loot

Automatically enables or disables combat logging based on location.

Redirect character errors, system messages and information messages.

Library that handles chat output.

A UI for searching the guild roster.