WowAce

Tracks rare drops, including companions and mounts

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

Show item levels in the character frame

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

An intuitive keybindings library.

Replacement for ActionButton_Show/HideOverlayGlow APIs

Creates and manages secure Action Buttons

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

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

Wowhead Data dump for GatherMate2

Restores access to removed interface options in Legion

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

Does stuff for sachmo

Simple Map Mod

Estimated range display. Type /rangedisplay for config

Another HUD addon

A library allowing for easy creation of graphs

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

Shared handling of alternate identity data between addons.

Custom widgets for AceGUI-3.0 and AceConfigDialog-3.0.