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
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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Wrath of the Lich King
3.3.5More addons for Wrath of the Lich King
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AdiBags
AdiBags displays the content of your bags in one view, distributed into several sections.
Scrolling Combat Text
Adds Scrolling Combat Text above your character.
XToLevel
Shows mobs, quests, dungeons and battles needed until you level.
Magic Targets 2
Frames that shows the current targets of the members raid or party.
VuhDo
Raid Frames providing click-heal functionality, buff and debuff control and much more
TradeskillInfo
TradeSkillInfo gives you all the information that you need about tradeskills.
ProfessionCapper
Shows you how to level up your trade skills in the fastest way.
Am I locked out?
Rembers which of your chars are saved to which instance.