WowAce

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

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

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

Libra

Library that tracks incoming heals

LibItemInfo-1.0

AddOn development framework

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

Tooltip scanning library.

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

Libary for cleanly inspecting other players

Collects Herbs, Mines, Gas Clouds, Archaeology, Treasure and Fishing locations and adds them to the worldmap and minimap

Simple and Advanced combined - Bartender4 ActionBar AddOn

Handy notes for your maps

Records Damage and Healing for Graph Based Display.

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

Toss those bugs inna sack.

Inserts some media into LibSharedMedia's storage.

Displays additional information for Mythic Keystone dungeons

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