WowAce

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

Various libraries based on LCD4Linux, offering users lower-level UI customizations.

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

Prat

DKP system for all guilds in the Banana Republic.

Manufac

Assessment

FuBar_VampwatchFu

OneBank3 will combine all the bank bags into one frame.

CandyBar style cooldown display

Display Garrison missons for all Characters

Adds mob patrol paths to your map.

A library to provide information about zones and instances.

Visualises healing.

Point to quest POIs on your minimap

ItemBonusLib

provides enchanters with a decent tool for managing their profession

Library providing mappings between trade skill recipes, spells and created items

TomTom CrazyArrow pointing to the targeted group member

Shows simple Buttons for your Cooldowns :)