WowAce

A library to help with localization of item types and subtypes.

an embeddable library providing an abstraction layer for tracking and querying Blizzard's Nameplate frames with ease and effi...

A library to provide mobIDs for bosses.

A Library for stat conversion, calculation and summarization.

TabletLib

Additional information about player spells.

A library to track nameplates.

Library handling communcation for Magic* addons

Libra

Database of Diminishing return categories and general data

TouristLib

Does stuff for sachmo

A library to help with localization of Zones.

A library that handles the basics of "window" style frames

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

Helper functions used by my addons, feel free to use them in your addon too

LibItemInfo-1.0

Static library of wow map data

A library to return spell duration and debuff type of a spellID.

Keeps track of healing spells cast by everyone in a group.