WowAce

Library that provides a timestamp that is equal across clients' timezones and system clocks

FuBar_FishingFu

Easily send items via COD

Allows shorter slash command handling

Use RAID comm to display Tol Barad and battleground resurrection timers while not dead

oUF_Castbar

BigWigs_NefCount

AltoComplete

Fully automated plague control for Putricide hard mode.

Mark the whelps in the Sinestra encounter

Dictator

Checks .lua files for excess and/or involuntary global variable access. NOT AN ADDON.

Provides compact ability duration bars for many cycle dependent classes.

New/Old BG indicator, Join by ID, Quick Leave Queue, etc.

Grid-style Indicators for sRaidFrames

aUF_Layouts

BubbleLoot

Sends any gold exceeding a set cap to a specified toon when opening a mailbox

Shows Ctrl/Alt/Shift indicators in the middle of your screen.

Prints the cooldown/GCD on the last spell cast to chat.