WowAce

Allows the user to customize the the tooltip with lua-scripts

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

HunterAEP

Gathers statistics on certain chance-on-use spells, also known as procs.

Automates bites during the Blood-Queen Lana'thel encounter in Icecrown Citadel

Shows your standings with the factions.

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

FuBar_PTReagentFu

RoleCall allows you to easily see the talent specs and roles of everyone in your group.

Blocks Chinese Chat

BiGOpt

A jukebox for playing wow embedded music.

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

Standalone of FuXPFu - Now sticks to anything!

SpyGnome

A customizable view of friends and guildmates.

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

Keeps track of space left in your bags.

Sphere

Mining data for Ackis Recipe List.