WowAce

Rebuff yourself with the mousewheel.

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

Shows class colors on player nameplates and names

PT3Browser

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

FlexBar2

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

provides enchanters with a decent tool for managing their profession

Prat

Load manager for AddOns

Adds party/raid role icons in useful places

Adds Archaeology items to AdiBags virtual groups

Heads-up minimap display

Keeps track of current money and all your characters on one realm.

Easily mail friends, guild members, alts and others

A collection of useful (guild management) tools and utilities for smarter than average bears.

Simple right click casting.

Adirelle's unit frames, based on haste's oUF.

Static library of wow map data

Quest library for mob location and other information