WowAce

InspectFix

Test whether the player can really dispell a buff or debuff, given its talents.

FuBar_TrainerFu

Adds various hearthing items to AdiBags virtual groups

NShakedown

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

A library that handles the basics of "window" style frames

Libra

Gives detailed descriptions of particular localities, as zones or instances, and provides optional TomTom integration.

Add-on that shows which mounts can be farmed this week

Sheppard

Standalone of FuXPFu - Now sticks to anything!

Tracks profession specific cooldowns and items across all your characters

Sphere

Display an informational fighter jet style HUD while flying or riding

Announces Mage Spells in chat.

Stores a browsable database of spells that mobs cast

Show extra information about Jewels and Enchants in tooltips.

Simple display and management of Away / AFK / Busy / DND status via broker or minimap

AspectsBar