WowAce

Recount2

Mana Regeneration Information

Check for flask/food buffs

Small Diamond Icon Pack for Cartographer

Automatically promotes a group of players to calendar event moderators.

AvionDefaultMedia

Tracks and reports party rolls

SpiritedCrane

Gives equipped and overall iLvl to indicate the quality of a character's gear.

A library to get localized boss names from the Encounter Journal

Envenomous

Synchronise friends among your characters

Tankadin

Adds filtering based on your known professions.

It's time to up your S.E.L.F.I.E. game!

Auto-target your Prospector/Milling/Enchanting skills. v1.18

With Mists of Pandaria Blizzard publish all characters from an account unless you disable that 'feature'. This addon warns you.

Nostalgia

Library to handle and store information about frame that are possible targets to anchor other frames to.

Clock plugin for any DataBroker display.