WowAce

FuBar_tTracker

Simple item compare tooltips

A module that lets you find out what today's dailies are without having to visit the quest givers.

OneBank

Customizeable UI to display the values tracked by AbsorbsMonitor

Adds dungeon role icons to Grid2

Meant To Do That

Object-orientation library

Hotkey interface for spells, macros, other clickables.

Expo

Status indicator that shows if a unit is hostile (probably mindcontrolled)

A Coordinates Data Broker plugin.

Manage your AddOns while logged into the game

Try to keep them thar pets wrangled

Changes several of the popup dialogs to not close when hitting the Escape key.

RuinBossTactics

Enables RatingBuster to calculate selected buff effects even if you don't really have them

Lute

Skin buffs with Masque

Adds 4 text indicators to the Grid frames.