WowAce

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

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

Tracks rare drops, including companions and mounts

Modular casting bar.

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

An intuitive keybindings library.

Wowhead Data dump for GatherMate2

Replacement for ActionButton_Show/HideOverlayGlow APIs

Creates and manages secure Action Buttons

A library allowing for easy creation of graphs

Restores access to removed interface options in Legion

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

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

Does stuff for sachmo

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

Arena unit frames

Another HUD addon

Shared handling of alternate identity data between addons.

Custom widgets for AceGUI-3.0 and AceConfigDialog-3.0.

Allows you to view all items from all your characters on the same account, when-ever and where-ever you want.