WowAce

Quest helping: fetching items to use, that sort of thing.

Spell overlay customization and spell state HUD.

PoisonMenu

Handles the assignment, coordination, and announcement of many parts of the Lich King encounter in Icecrown Citadel.

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

Filters AFK and DND messages after you've seen them once.

First Aid data for Ackis Recipe List.

Leveling guides for trade skill professions.

Used to visualize and change values of variables/variable-trees in game

Historian

Merchant, gossip and taxi tweaking module for TweakHub.

Manages the scanning of the auction house in a reliable an efficient manner.

wRlog

Enhances the StackSplitFrame with numbered Buttons, a '1-Click Mode' and a 'Auto Split Mode'.

Debuff Monitor: A Powerful & Configurable Raiding Tool

Adds custom effects to your cursor.

Automatically sells low quality gray items and selected white items to the vendor.

Simple library that handles multiple levels of logging.

A boss encounter engine used by other add-ons

FuBar_VolumeFu