WowAce

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

Displays online friends.

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

Adds Outfitter set filters to AdiBags.

WQA helps you find world quest groups easily. Works after the 4/28 group finder changes.

Nihilum Raid Tracker, originally written for the EU guild Nihilum.

Keeps track of performance of memory, latency, and framerate.

An auction house AddOn to make the life of each fence easier.

Detects specific CDs and spellcasts

Target Debuff monitor. Stacking aware, giving current and potential debuff status.

A full package of auras for all 3 Shaman specializations

Automatically and immediately cancels all in-game cinematics and movies

FuBar_RecZone

Cryolysis 2

Displays friend notes in unit tooltips, at logon, and in /who results.

You've got mail!

AspectsBar

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

A library to get currencies' related information

Shows Chat as Combat Text