WowAce

Postal: Enhanced Mailbox support

"Debug" code free since '93!

Tracks rare drops, including companions and mounts

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

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.

Myslot is for transferring settings between accounts. Feedback [email protected]

An intuitive keybindings library.

Does stuff for sachmo

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

Replacement for ActionButton_Show/HideOverlayGlow APIs

Estimated range display. Type /rangedisplay for config

Enables multi-line/unlimited-length pasting of text or commands into WoW

Creates and manages secure Action Buttons

Another HUD addon

Inserts some media into LibSharedMedia's storage.

Wowhead Data dump for GatherMate2

Simple Map Mod

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

Shared handling of alternate identity data between addons.