WowAce

Quest helping: fetching items to use, that sort of thing.

RaidHelper

Embeddable chat throttling library with traffic shaping and priorities

Does a /who search of multiple dungeons.

An extra set of 11x3 buttons, integrated into the default action bar.

Used to visualize and change values of variables/variable-trees in game

Adds item values to chat messages.

FuBar_MiniClockFu

ItemEnchantApplication

Information display for Hunters.

View any characters bank and bags from anywhere. Stores items in Baggins submenu "Anywhere Bags."

Adds your damage to Scrolling Combat Text

Test whether the player can really dispell a buff or debuff, given its talents.

A plugin for OneBag to make your keyring the same texture as OneBag/Bank.

Ghost: Pulse

Allows frames to be dragged around, without permanently changing their position.

Welfare Epics

Speeds up triggering actions such as items or spells by triggering them on key/mouse down rather than release

Allows customisation of login/logout system messages.

AbacusLib