WowAce

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

Show item levels in the character frame

An intuitive keybindings library.

Officially the original source for where things are in the Broken Isles, in HandyNotes

Replacement for ActionButton_Show/HideOverlayGlow APIs

The original HandyNotes source for where things are in Battle for Azeroth

Creates and manages secure Action Buttons

Does stuff for sachmo

The original source for where things are in Pandaria

Tracks Raid/Instance/World Boss lockouts for all your characters, daily/weekly quests, currencies, trade cooldowns, and more!

Modular damage meter.

Officially the original source of knowledge of where things are in Draenor during Warlords, in HandyNotes

Adds a Button to the Worldmap which toggle Handynotes

"Debug" code free since '93!

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

Simple Map Mod

A library to help with localization of the output of UnitCreatureType.

Another HUD addon

A library to help with localization of in-game subzone names.

Shared handling of alternate identity data between addons.