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

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

The original source for where things are in Pandaria

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

Does stuff for sachmo

Postal: Enhanced Mailbox Support

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

A skinning engine for button-based add-ons.

Shared handling of alternate identity data between addons.

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

Provides one or many frames for dumping text into.

A library allowing for easy creation of graphs

A library to help with localization of bosses.

Estimated range display. Type /rangedisplay for config

Inserts some media into LibSharedMedia's storage.

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

A library to help with localization of factions.

Simple Map Mod

Core module for Loot and Looting-related UI improvements