WowAce

A library to help with localization of factions.

Library that tracks incoming heals

A library to provide unit-oriented tags to LibDogTag-3.0

AddOn development framework

A library to provide a markup syntax

Library providing mappings between trade skill recipes, spells and created items

Parses ToC and adds About panel to Interface options

Provides one or many informational windows with optional interactive widgets.

Makes the Blizzard options frame movable and resizable

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

Good old LibTourist-3.0 for WoW Classic Cataclysm

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

A library to provide information about zones and instances.

Library to provide visual bar creation and management.

A library to provide mobIDs for bosses.

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

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

Some handy events that should exist in the default UI

A library to help with localization of talent trees.

Additional information about player spells.