Pawn
Pawn calculates scores for items and tells you which one is better for your spec.
Wrath of the Lich King 
Mists of Pandaria 
Cataclysm Addon Details
Expansion
Categories
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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The Burning Crusade
2.4.3More addons for The Burning Crusade
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In-game theorycraft. Calculates actual damage/healing based on gear, talents and buffs.
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A remake of the built-in lootframe.
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Replaces the default Fonts with several easy to read options.
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Single window displays for your inventory, bank, and keys.
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Cooldown count for everything.
FramesResized
Resizes some default UI frames (GuildUI, LootFrame, RaidInfo, TradeSkillUI and TrainerUI) to show more lines
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Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).
ArcHud2
Placed on your screen where you can see your hp, mana and cast bar.