WowAce

Provides one or many informational windows with optional interactive widgets.

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

Library that tracks incoming heals

Tooltip scanning library.

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

Shared handling of alternate identity data between addons.

Libra

LibItemInfo-1.0

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

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

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

Handy notes for your maps

Inserts some media into LibSharedMedia's storage.

Records Damage and Healing for Graph Based Display.

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

Simple and Advanced combined - Bartender4 ActionBar AddOn

Postal: Enhanced Mailbox support

Utility library with shared functions and data for various addons by NeoTron.

Simple library that handles multiple levels of logging.

tekKonfig