WowAce

an embeddable library providing an abstraction layer for tracking and querying Blizzard's Nameplate frames with ease and effi...

Death analysis tool

Displays Instance Maps

View bank, inventory, mail, equipped and guild bank contents from any character anywhere!

Shows simple Buttons for your Cooldowns :)

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

Visualises healing.

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

Inspects all members of raid and saves in database, as well as lists people's dkp values

Set and manage character notes that are displayed in unit tooltips and /who results.

Tracks SendAddonMessage Spam

HUD that you can tweak the way you want.

DogChow

Incubator

OneBank3 will combine all the bank bags into one frame.

Displays online guild mates.

View an image of your guild vault from anywhere.

Barks at you when you target a crowd-controlled unit

Allows you to preview weapon glow in Dressing Room.

Shows ZoneInfo on the World Map in a perfectly cromulent fashion.