WowAce

Creates and manages secure Action Buttons

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

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

Arena unit frames

Simple Map Mod

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

Show item levels in the character frame

Does stuff for sachmo

Provides one or many frames for dumping text into.

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

Shared handling of alternate identity data between addons.

"Debug" code free since '93!

In World of Warcraft healers have to die. This is a cruel truth that you're taught very early in the game. This add-on helps you influence this unfortunate destiny in a way or another depending on the healer's side...

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

Restores access to removed interface options in Legion

Enables multi-line/unlimited-length pasting of text or commands into WoW

A library to help with localization of bosses.

Replacement for the default UI's StaticPopup dialogs.

Adirelle's bag addon.

A skinning engine for button-based add-ons.