WowAce

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Display bag usage on each of your bag slots.

Displays an alert whenever you loot an item for the first time.

Calculates optimal reforging for given weights/caps.

Gives a score for your kit allowing easy comparison with others, also colour codes kit based on appropriateness for your level.

Considers an item against all the items you have to determine whether or not it is an upgrade

Shows where the equipment of inspected users or yourself is from.

Provides information of tradeskill and crafting materials that are in the banks and bags of your characters.

Tracks profession specific cooldowns and items across all your characters

Priority 3 loot announce addon

NextStep

A tool to appraise, estimate, or judge your equipment against the equipment of others.

Stable

Saves contents of your guild bank and sends/receives updates over the addon channel

FuBar_OutfitterFu

Helps you automate selling stuff.

PreferredItems

KC_Items

ClosetGnome_Mount

OneBag