WowAce

Piece of mind by being one with your class.

adds navigation buttons to Encounter Journal

Shows Chat as Combat Text

Prints a message in your default chat frame when someone in your group gains an aura.

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Speed plugin for any DataBroker display.

A Library for stat conversion, calculation and summarization.

SanityItemCache

Library to provide visual bar creation and management.

PT3Bar

Automatically generate and announce optimal spirit totem assignments during the Gara'jal encounter in Mogu'shan Vaults.

quick quest turnin and acceptance with a shared keybind

Cartographer_Trainers

Quest information

Displays friend notes in unit tooltips, at logon, and in /who results.

Display bag usage on each of your bag slots.

DynRepBar

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

Battleground Timers in a HUD around the Blizzard BG status

Heal and decurse by clicking on customizable raid/party unit frames