WowAce

Afflictions display and cleaning for solo, group and raid with advanced filtering and priority system.

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

Does stuff for sachmo

Show item levels in the character frame

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

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

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

Arena unit frames

The original source for where things are in Pandaria

Give whispers an instant messenger feel.

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

Shared handling of alternate identity data between addons.

A library to help with localization of races.

Provides one or many frames for dumping text into.

A library to help with localization of bosses.

Adds a Button to the Worldmap which toggle Handynotes

A library to determine estimated range.

Library of compressed itemid sets.

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

A skinning engine for button-based add-ons.