WowAce

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

A friendly companion that remembers the chat.

Core module for Loot and Looting-related UI improvements

Addon to manipulate the map

Timers for Buffs, DOTs, CC effects, etc..

Prat

Calculates and shows your TankPoints in the PaperDall Frame.

Track time played, rested XP and money for all characters

Cleans up minimap buttons and makes them accessible through a pop out menu!

A simple combat log that displays events similar to SCT

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

CT_RaidAssist style raid frames

Rebuff yourself with the mousewheel.

Create panels for customizing your UI, sucessor to eePanels

Displays online guild mates.

Antagonist

manipulate the minimap in numerous ways; move, scale, skin.

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

ItemSync the happy item gatherer and toolkit.

Shows skills in a tooltip and allow them to be used. Also keeps track of Cooldowns.