WowAce

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

A system config addon to WOW

Creates a broker plugin for all your broker launchers

Shows the spec of people around you in the tooltip.

Really very early stage. No, earlier than that.

Calculates the relative value of attributes towards physical dps.

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

Item link modification

"Your quest log is full". How many quests do you have in your log?

Shift-clicking on a user name in chat shows a tooltip with their whois information.

Tools to easily compare gear among party members.

Pre-Alpha of SpiderEyes power desplay. Do not distribute!!

Very very simple tooltip

Adds tooltip for debuffs (and other things? you found out: no).

Shows what stat was reforged in item tooltips.

Enables RatingBuster to calculate selected buff effects even if you don't really have them

Shows the Guild Achievements Points and Members in the tooltip

Provides info about spell teaching items.

Adds an icon to item, spell, and achievement links

A standalone addon to walk around the 4.0.1 inspecting BUG. Also provides help for other addon that need Inspecting