WowAce

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

Co-ordinated targetless Party and Raid wipe recovery. Evolved

Shows the mirco menu and game menu in a clickable broker tooltip.

Adds a button to undress the model in the Dressing room.

StarTip (Tooltips from Outerspace)

MorgDKP

Tracks the current Fear Ward's in the raid or party.

Static library of wow map data

In-game EPGP guild helper, supports standby, main/alt shared pools, minEP, offpecGP. Fixed price list with progress multiplier.

TabletLib

Helps you automate selling stuff

Smart raid loot and DKP tracker with automated standby and learning

Open all your mail

StatLogicLib

Proximo

Keeps track of durability and pops up a dialog to repair when you go to a vendor who can.

Better quest log and tracker

ItemPriceTooltip

HUD that you can tweak the way you want.

Pins on the World Map for quests you have not completed yet