WowAce

AddOn development framework

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

A library to provide information about zones and instances.

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

A library to provide a markup syntax

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

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 Era

A library to provide mobIDs for bosses.

Additional information about player spells.

Provides one or many informational windows with optional interactive widgets.

A library allowing for easy creation of graphs

Good old LibTourist-3.0 for WoW Classic Cataclysm

Database of Diminishing return categories and general data

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

StatLogicLib

Parses ToC and adds About panel to Interface options

Fires events whenever a raid member "fails."

A library to help with localization of Zones.

Dropdown library for Ace3 options, extensible to other options formats. Works ok.