WowAce

aUF_RangeCheck

Incubator

Add item levels to Inventorian

StarVisuals displays various data visualizations

Adds the toon name to the alert that your RealID friend has come online.

Aspect checker addon for Hunters.

Displays an alert whenever you loot an item for the first time.

Sorts the Wardrobe

Separate indicator for your HoTs with timer.

Adds party/raid role icons in useful places

Tracks profession specific cooldowns and items across all your characters

FuBar_CombatTimeFu

Simple library that handles multiple levels of logging.

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

A FuBar plugin to show Recount.

Calculates optimal reforging for given weights/caps.

Aura alarm.

Provides a LibDataBroker plugin for quick access to professions under Ackis Recipe List.

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

Keeps track of space left in your bags.