WowAce

LibRockComm-1.0

RS_ClassColors

Shows attachment count in Inbox icon.

Automatically restock items from vendors and your bank

Communicates with guild members for their positions on the world map

Relog

Tooltip scanning library.

Guide Handler UI.

GirlFriend

AllYouCanEat shows information about the following statistics: beverages, foods, bandage types, potions, elixirs and flasks.

JostleLib

Automagically draw your weapons !

A Data Broker add-on for quickly switching your specialization with gear set and loot specialization.

Automatically sells low quality gray items to the vendor.

A library that maintains a cache of items and their types.

Customizing your buff display

A library that tells wether a item is a quest item or not (equipped or in bags)

Shows at-a-glance what raid buffs/debuffs you have.

Allows custom-triggered boss mod timers to be created

Quickly builds /target macros for immediate use.