WowAce

Adds talent specialization role status to Grid.

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

ClosetGnome_Mount

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

Calculates optimal reforging for given weights/caps.

Displays online guild mates.

Broker plugin to display player orientation

Reno is a slash-command that can patch predefined options in a macro to change which abilities will be chosen.

Add-on that allows you to setup and quickly switch between different profiles of your action bars

Keeps track of space left in your bags.

Monitor the remaining duration on your Mysterious Eggs and other perishable items.

SwapMagic

Spyglass

GetInLine

Helps you decide which ability to use next according to priority you set

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

FuBar_CheckStoneFu

Aspect checker addon for Hunters.

A clone of the FailBot mod. Announces raid member failures such as "Player1 fails at frogger"

A Library for stat conversion, calculation and summarization.