WowAce

Simple AceGUI3 dropdown item classes for font/statusbar/sound/etc.

Tracks rare drops, including companions and mounts

Show item levels in the character frame

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

An intuitive keybindings library.

Modular casting bar.

Replacement for ActionButton_Show/HideOverlayGlow APIs

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

Creates and manages secure Action Buttons

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

Does stuff for sachmo

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

Restores access to removed interface options in Legion

Another HUD addon

A library allowing for easy creation of graphs

Custom widgets for AceGUI-3.0 and AceConfigDialog-3.0.

Shared handling of alternate identity data between addons.

Keeps track of group members and keeps an up-to-date cache of their specialization and talents.

Arena unit frames

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