WowAce

Says if anyone got too many stacks of Inoculated.

Where the pet tamers are

A library that provides a way to get server-side random values.

Warns if anyone has taken too much damage to cause the Orb Whisperer achievement to fail.

Displays an estimated swing timer for monsters

Checks on entering combat whether or not the entire raid has only blue gear equipped

Runs pool-fishing contests

MacroMagic saves space in your addons by consolidating a common set of commands into a single shortcut.

Counts how many Swarm Scarabs that are alive in the Anub'arak encounter

When a new icon ("vignette") shows up on the minimap, shout about it

Make health bars based on 10k health when unit has Finkle's Mixture.

Waypoints for Pandaria Treasures

"This addon will update your macros to always point at your tank"

ScrubbingUI

Templar is the ultimate Mage Assistant

Runs guild pool-fishing contests

AWbags

Let everyone know how much fail they are

oUF module providing LIbScriptable text widgets for layout use.

Polaroide