WowAce

opens/closes all bags when at merchant (instead of only the backpack)

Notifies you of experience gains

Death reports

FuBar_AbramsFu

eePanels2

Automatically sells low quality gray items and selected white items to the vendor.

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

Save and send chat messages to many channels. Allows quick item and profession linking within your messages.

A library to help with localization of Archaeology artifacts

fmBuffCheck

Replacement for default bags.

nRaidTracker

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

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

Shows who controls Wintergrasp and the time until the next battle.

item2phpBB

Draws some lovely 3D portraits in the standard Blizzard artwork.

FuBar_SWStats2Fu

Relog

Makes those pesky garrison animations go away.