WowAce

Simple Bars for your Shaman's weapon buffs and shield spells.

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

A library to help with localization of Archaeology artifacts

Buffalo

Libary for cleanly inspecting other players

A filter tool for blizzards TradeSkillUI

Light-weight enhanced casting bars

Restores channels and channel-window associations after disconnects remove them.

oUF_HolySmurf

Makes the message dialog movable

FuBar_ItemListFu

A FPS Data Broker plugin.

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

A collection management library similar to .NET's System.Linq

Displays a grid of guild ranks versus permissions.

Keeps track of resurrection spells cast in a group

Centralised management hub for small tweak, interface and utility addons.

Draws 3D portraits for main units that can be moved or resized at will.

CleanShot

Show a texture on demand