WowAce

View party member quest logs

Enable/Disable addons for your character in game

Provides database of quest giving npcs/mobs/objects for display on the World Map/Minimap

tekSupport

Make it easy to explain bosses in Raids.

Replacement for default bags.

Warnings about tanking specific abilities

Shows class colors on player nameplates and names

Configuration library

Check the consumable usage of your raid

FuBar_FactionItemsFu

Tracking and ranking of dps/hps in a guild.

Smooth group roll frames

Reorients the camera to be behind the character after a charge.

A customizable view of friends and guildmates.

Combine

Shows learned recipes of all characters.

lugMD

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Display the global cooldown around your cursor. (+ other stuff)