WowAce

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

Postal: Enhanced Mailbox Support

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

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

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

A skinning engine for button-based add-ons.

An intuitive keybindings library.

Creates and manages secure Action Buttons

Replacement for ActionButton_Show/HideOverlayGlow APIs

Estimated range display. Type /rangedisplay for config

Inserts some media into LibSharedMedia's storage.

Does stuff for sachmo

Simple Map Mod

Core module for Loot and Looting-related UI improvements

Adds a Button to the Worldmap which toggle Handynotes

Modular casting bar.

Shared handling of alternate identity data between addons.

Another HUD addon

A library to help with localization of in-game item sets.

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