WowAce

Adds Friend and Guild options to the context menu of player units.

XArt

Don't underestimate your little critters!

Information display for Hunters.

Shows optimal target to use various area healing spells

Jigsaw

Library to help with querying unit talents.

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

Saves contents of your guild bank and sends/receives updates over the addon channel

LibDogTag-2.0

SliceWatcher

Fires events whenever a raid member "fails".

ClosetGnome_Fishing

Embeddable chat throttling library with traffic shaping and priorities

Automatic tracking of the current target's creature type. For the discerning PvE hunter.

Control screenshot format and quality via FuBar

Collects, analyzes and presents information about the virtual economy.

Retooled Professions

Nudge

JasonQuest