WowAce

Assister

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.

Improved Quest Tracker

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

Add SyLevel item level display support to Bagnon.

Dims action buttons.

A customizable view of friends and guildmates.

Shows you the radius of your totems.

Check the consumable usage of your raid

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

Niagara

A simple interface for unitframe click casting.

Shows the minimum durability of equipped items on the stats frame.

Good looking, smoothy and helpful nameplates

A menu with useful searches for Inventorian

A small checklist for raid (de)buffs and who brings what.

Taggle

Disease Tracker for Death Knights.

MiniPet, Always keep your little companion with you, based on the work of Carra.

Library to help with querying unit talents.