WowAce

Monitors for friendly deaths and announces them as in Myth: The Fallen Lords

Database of important locations for HandyNotes

Cartographer_Treasure

JasonQuest

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Volume control panel.

FuBar_VolumeFu

Provides the /in command for delayed execution.

Smooth group roll frames

Pet Theory

Provides database of quest giving npcs/mobs/objects for display on the World Map/Minimap

Display the global cooldown around your cursor. (+ other stuff)

Simple library that handles multiple levels of logging.

Allows you to browse your clients database

Scorchio!

Expo

Raid loot system.

pDebuffList

FuBar_ArenaFu

StitchUI