WowAce

Displays a grid of guild ranks versus permissions.

Doodle

A library to return spell duration and debuff type of a spellID.

Draws some lovely 3D portraits in the standard Blizzard artwork.

LDB data source displaying rested XP for whole account

Allows custom-triggered boss mod timers to be created

A standalone version of Angry Assignments to create and display personal notes on your screen.

Displays an alert whenever you loot an item for the first time.

Scorchio!

Embeddable library to track raid/party roster

GirlFriend

Complain about crowd control breaks.

FuBar_TinyTipFu

Displays events from Calendar for upcoming week in tooltip.

PiraPlex

Track of your tradeskills across characters, create small buttons for them and track cooldowns.

View all your Auctions on any DataBroker display.

Ghost: Pulse

InstanceMaps

Gives equipped and overall iLvl to indicate the quality of a character's gear.