WowAce

Speed plugin for any DataBroker display.

Customize the PlayerPowerBarAlt display

Shows a countdown bar for the duration of auras (e.g. HoTs, DoTs)

A system config addon to WOW

Fubar Plugin for Simple Soulstone

Enhances the Equipment Manager to let you control the helm/cloak visibility for each set.

Automatically and immediately cancels all in-game cinematics and movies

Allows movement and scaling of class-specific resource displays

Makes the Blizzard options frame movable and resizable

Advanced Chat Filtering and Spam Blocking Addon

Tool for easy task assignments in raids.

ERP

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Fancy up the ExtraActionButton frame

Improvements to the standard Blizzard Eclipse bar for balance druids. Use /ebp for the config screen.

PVPtimer

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

Adds 3 corner indicators to each corner of the Grid frames.

Tracks Black Market Auction House auctions.

Communicates with guild members for their positions on the world map