WowAce

Posts a BigBrother-QuickCheck to the raid-channel when a readycheck is started

A tool to appraise, estimate, or judge your equipment against the equipment of others.

Saves contents of your guild bank and sends/receives updates over the addon channel

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

RapidCast

Hemlock

IDCard

Collect data about you myth+ challenges

FuBar_CheckStoneFu

Shows who controls Wintergrasp and the time until the next battle.

Tells you if you're buffed

HiveMind

Calculates DKP based on Item Level

Lets you drag UI frames around

Options for TinyTip

Automates bites during the Blood-Queen Lana'thel encounter in Icecrown Citadel

Libary for cleanly inspecting other players

Fixes strata bugs in UI windows

Timerbar embeddable library

BigWigs_HealbotAssist