Pawn
Pawn calculates scores for items and tells you which one is better for your spec.
The Burning Crusade 
Mists of Pandaria 
Cataclysm Addon Details
Expansion
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Developers
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Pawn helps you find upgrades for your gear and tell which of two items is better for your spec.
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Wrath of the Lich King
3.3.5More addons for Wrath of the Lich King
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Filter out specific debuffs and buffs into separate frames.
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A lightweight addon that tracks auction house data and improves the auction house interface.
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