WowAce

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

Tracks the Blood Shield for Death Knights.

Keeps track of current money and all your characters on one realm.

Manufac

ArcHUD2

DogChow

TuiRaidTracker

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

Allows the user to preview and track their progress in the collection of various transmogrification appearance sets

Dynamic item DKP calculation

Display Garrison missons for all Characters

Shows Status Bars that you can drag around and group up for your cooldowns

Incoming Heals

Keeps track of performance of memory, latency, and framerate.

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

Compact rune and proc display for Death Knights.

Does stuff for sachmo

Provides quick access to information on your group and their equipment, enchant and gem choices.

Displays the locations of Lunar Festival elders.

Angry Assignments