WowAce

Make the unit frame fade if out of range.

Save, load key bindings, set autoload for specchange, etc

Uses Loot-a-Rang on double right click

Adds quest level tags to log and watcher.

Medley

Envenomous

Baggins_BtmScan

Encodes and Decodes between Lua tables and JSON/CSV.

Adds dungeon role icons to Grid2

An enhancement to the built-in raid frames to change color for debuffs.

Grid status module that shows the remaining value of any effect tracked by AbsorbsMonitor

FuBar2

UIThing

Shows attachment count in Inbox icon.

Customizable text display of character's power.

BiSList allows you to configure your BiS items list, and keep track of how far you are from them

When WOW fails to detect the SteelSeries WOW mouse, try to re-enable it

Intended to be a complete guild management tool suite)

Steroids

RareCaller