WowAce

Adds aggro coloring to oUF.

aX_RaidStatusConfig

The ultimate in lazy Ulduar raiding

Out of Mana bar.

Adds an additional spell alert if you have more than one charge of a buff that is normally tracked by the in game spell alert...

Allows raid leaders to view information on raid or guild member equipment information

A customizable buff/debuff display replacement for the default Blizzard frames (with right click cancelaura support).

Adds custom layouts for Grid

Steroids

Reports in the Default Chat Frame how many people does not have Well Fed effect, and who are they

Gnomish math at its best!

Allows communication to be shared across realm through Battle.net.

Opacity effect on action buttons in cooldown.

Adds unreal tournament style sounds to PvP encounters.

SVG Render-bender

Add-on that shows which battle pets can be farmed this week

GraphLib

Remaining and rested XP Data Broker plugin.

Reputation tweaking module for TweakHub with auto watched faction selection and detailed rep info updates.

Melee stats Data Broker plugin.