WowAce

Shared handling of alternate identity data between addons.

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

AddOn development framework

Library to check whether an item is equipable / appropriate for a given class

Tooltip scanning library.

tekKonfig

Library providing mouse-click support for LibQTip-1.0.

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

A library to help with localization of talent trees.

Adds an addon manager in game via the 'Addons' menu. Special support for multi-part addons. Based on rMCP by Rophy.

Simple embeddable publish-subscribe implementation.

A library to provide information about zones and instances.

Movable frame library.

GratuityLib

Library to handle and store information about frame that are possible targets to anchor other frames to.

Dropin replacement library for SetBackDrop

LibGUIFactory-1.0

Creates and manages secure Action Buttons

A library to provide a clean dropdown menu interface.

A library to help with localization of Zones.