WowAce

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.

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

Show item levels in the character frame

Database of item upgrade IDs

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

Arena unit frames

The original source for where things are in Pandaria

Replacement for ActionButton_Show/HideOverlayGlow APIs

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

An intuitive keybindings library.

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

Creates and manages secure Action Buttons

Another HUD addon

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

Estimated range display. Type /rangedisplay for config

Adds a Button to the Worldmap which toggle Handynotes

Ackis Recipe List is an addon which will scan your trade skills and provide information on how to obtain recipes. It works fo...

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

Simple Map Mod