WowAce

Recount2

RollWatcher

Reduces achievement spam when a group of people earn the same achievement.

An in-game list of all hunter pet families and their abilities.

LibCooldown-1.0

Tells your party members when you interrupt stuff, or fail to do so.

Displays and Counts Gems.

This AddOn will automatically withdraw all your enchanting vellums from reagent bank.

Adds the ability to send mass mails to guild ranks.

Winded

Tracks Prayer of Mending and changes color based on the number stacked

FuBar_HealBotFu

TrafficJam

OneStorage

Addon for priority management of combat skills for all classes

Unsolicited

Automatically buy grocery bags for items you have enough of.

Advanced features for sRaidFrames

Provides cooldown timers for abilities you want to track

Shows the source of an item as a tooltip