WowAce

A Library for stat conversion, calculation and summarization.

Fires events whenever a raid member "fails."

TabletLib

Library handling communcation for Magic* addons

Static library of wow map data

Test whether the player can really dispell a buff or debuff, given its talents.

A library to get currencies' related information

A library to help with localization of talent trees.

A library to help with localization of classes.

Embeddable chat throttling library with traffic shaping and priorities

Simple library that handles multiple levels of logging.

IncomingHealsLib

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.

Library supporting plug in filters.

Provides data about all artifacts in the player's possession.

Various libraries based on LCD4Linux, offering users lower-level UI customizations.

Library to help with querying unit talents.

A library for PvP and Battlegrounds

Threat-2.0

A library to track nameplates.