WowAce

Parses ToC and adds About panel to Interface options

Simple AceGUI3 dropdown item classes for font/statusbar/sound/etc.

Show item levels in the character frame

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

Arena unit frames

A library allowing for easy creation of graphs

The original source for where things are in Pandaria

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

Another HUD addon

Adds a Button to the Worldmap which toggle Handynotes

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

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

Estimated range display. Type /rangedisplay for config

Shows the possible loot from the bosses

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

Simple Map Mod

Database of item upgrade IDs

Modular damage meter.

An intuitive keybindings library.

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