WowAce

FuBar_LootTypeFu

Automagically call who should cross over

Shift-clicking on a user name in chat shows a tooltip with their whois information.

Save and send chat messages to many channels. Allows quick item and profession linking within your messages.

A library which provide tools for detecting adverse effects on units.

Adds tooltip for debuffs (and other things? you found out: no).

LatencyAlert

SCT_Cooldowns

Makes the Battle Objectives Frame movable

I've invented a device that tells you when reactive abilities are available!

FuBar_TalkFu

A filter tool for blizzards TradeSkillUI

A fountain of fonts for your funktastic UI.

A Library for hooking tooltips.

Adds support for LibFilter to Baggins

oUF Layout

With Mists of Pandaria Blizzard publish all characters from an account unless you disable that 'feature'. This addon warns you.

Enable/Disable addons for your character in game

Provides data about all artifacts in the player's possession.

MobHealth3_BlizzardFrames