WowAce

Provides info about spell teaching items.

Adds CSV output to Ouro Loot

Simple quest item auto keybinder

Add-on that semi-automatically distributes reagents between alts

Broker plugin for the Blizzard Equipment manager

Enables RatingBuster to calculate selected buff effects even if you don't really have them

Adds Auctioneer "bought for" filters to Baggins ("disenchant", "vendor", etc)

Keep you bags clean with easy loot filtering and removal.

GearEvaluator_ItemBonusLib

Enables autolooting when a fishing pole is equipped and disables it afterwards.

AtlasLoot wishlist match.

nanoPar

Equipment swap on spec change, Bind key to equipment sets

OneRing

A Just for fun addon that converts money displays to show totals based off Harry Potter's currency system

Simple cloak/helm checkboxes in the Character frame

Library for summing up all stats from itemlink

Automagically click yes on BoP dialogues.

OpenBankBags

Displays the number of empty bag slots on your backpack icon, just like WoW Retail.