WowAce

LibItemInfo-1.0

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

Grabs bugs for the bug sack.

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

Records Damage and Healing for Graph Based Display.

Shows the possible loot from the bosses

Uses various methods to scan your surroundings for rare or specified NPCs.

Displays additional information for Mythic Keystone dungeons

AddOn development framework

Handy notes for your maps

Modular damage meter.

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

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

Angry Assignments

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

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

A framework for chat ehancement modules.

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

Restores access to removed interface options in Legion