WowAce

Auto roll greed, need, pass or manually roll on items.

Tracks your keystones

A data broker display, that shows one block per plugin.

provides enchanters with a decent tool for managing their profession

Role playing AddOn that shows extra information about characters as entered by the player.

Database of FlightMaster locations for HandyNotes

Tracks skill and tradeskill costs and progressions, as well as trainer locations.

Loot Distribution System

A jukebox for playing wow embedded music.

Auto and random summon highly customizable for your pets and mounts, with Data Broker support.

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

Should I send that recipe to my alt?

Automatic Refilling of User Defined Items

Heads-up minimap display

Incubator

DaHud

Animated target indicator

Display an informational fighter jet style HUD while flying or riding

Nihilum Raid Tracker, originally written for the EU guild Nihilum.

Adds manabars to the sides of Grid frames.