WowAce

Database of Diminishing return categories and general data

LibItemInfo-1.0

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

Library that tracks incoming heals

Provides one or many informational windows with optional interactive widgets.

Shared handling of alternate identity data between addons.

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.

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

Static library of wow map data

Handy notes for your maps

Fires events whenever a raid member "fails."

Simple and Advanced combined - Bartender4 ActionBar AddOn

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

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

Postal: Enhanced Mailbox support

Inserts some media into LibSharedMedia's storage.

Afflictions display and cleaning for solo, group and raid with advanced filtering and priority system.

Displays additional information for Mythic Keystone dungeons

Where are the hidden treasures in Battle for Azeroth? Show in HandyNotes