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..

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

Calculates and shows your TankPoints in the PaperDall Frame.

Create panels for customizing your UI, sucessor to eePanels

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

Track time played, rested XP and money for all characters

Prat

CT_RaidAssist style raid frames

A simple combat log that displays events similar to SCT

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

Displays online friends.

Keeps track of quests.

Adds Scrolling Combat Text above your character

FuBar_HonorFu

Keeps track of your top hits, heals, criticals, etc.

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