WowAce

A Perl layout with oUF.

IFrameManager

Warnings about tanking specific abilities

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

T_RPP

PVPtimer

Skills plugin for any DataBroker display.

Deformat

MAcon

Eliminates the spam from the chatframe and sums it up in a broker plugin.

LD50_abar

Gives equipped and overall iLvl to indicate the quality of a character's gear.

Helps to track outgoing mails

SimpleChatMods

Displays a reliable cooldown timer for the Shaman Ascendance ability

Allows communication to be shared across realm through Battle.net.

AuctionSort

A variant of AceGUI's Frame container with an editable input field

BankItemsFu

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter