WowAce

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

A library to help with localization of classes.

Improve your barbershop experience with appearance profiles!

FuBar_AbramsFu

InfiniBar-2.0

Raid Cooldowns

Embeddable chat throttling library with traffic shaping and priorities

YssGuildShop

Provides information of tradeskill and crafting materials that are in the banks and bags of your characters.

Open those pesky lockboxes

Monk Brewmaster/WindWalker Priority and Buff/Debuff Tracking Tool

TrackingBar

A library to help with localization of talent trees.

Adds four icon indicators to Grid (top, bottom, left and right).

Tracks vulnerability debuffs on multiple mobs

Allows frames to be dragged around, without permanently changing their position.

Aperture

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

Gives a Smoother Quest Experience

Shows skills in a tooltip and allow them to be used. Also keeps track of Cooldowns.