DrDamage
In-game theorycraft. Calculates actual damage/healing based on gear, talents and buffs.
Mists of Pandaria 
The Burning Crusade 
Wrath of the Lich King Addon Details
Expansion
Developers
Having issues?
DrDamage displays the calculated, average damage or healing of abilities with talents, gear and buffs included on your actionbar buttons. The addon will also add various information to the default tooltips in your spellbook and on the actionbar.
Download DrDamage
Cataclysm
4.3.4More addons for Cataclysm
Discover other addons that might interest you
TradeskillInfo
TradeSkillInfo gives you all the information that you need about tradeskills.
Docs Nameplates
Change the look and feel of your default nameplates.
Proudmoore Mythic Plus UI
Proudmoores M+ addon
xanDebuffTimers
A small text based progress bar system for target debuffs.
SlamAndAwe
Monitors Warrior abilities and prioritizes them based on customized settings.
TipTac
Highly Customizable Tooltip Enhancement Addon.
ConfirmLeaveParty
Asks for confirmation to leave a group inside an instance.
GearCheck
Request others average Item-Level and answers to those requests