WowAce

This is an add-on to block incoming guild/party/duel requests (except for friends/party/guild) (previously ASSBlock)

Automatically sells low quality gray items and selected white items to the vendor.

Automagically call who should cross over

Shows missing buffs and handles welfare and deluxe buffs as one (motw/gotw, blessings, etc.). This lets you see when you nee...

oUF layout looking like ag_Unitframes and Grid.

Monitor the remaining duration on your Mysterious Eggs and other perishable items.

LibBabble-Spell-3.0

On login, displays changes to your guild since the last time you logged in.

Dedicated to Lazybones of EU Khadgar who had the original idea as he can't find a damn thing in his bags. You're a great guy...

Fancy up the PlayerPowerBarAlt frame

A 'channeling spell'-tracking addon for Affliction Warlocks. Drain Soul, Drain Life/Harvest Life and Malefic Grasp.

Simple and rich Death Knight rune customizations

FuBar_GemWatchFu

SVG Render-bender

Death reports

An extra set of 11x3 buttons, integrated into the default action bar.

DebuffEnough

Tells you who bought your auctions.

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

FuBar_DPS