WowAce

Makes it very easy to collect rare battle pets.

Baggins_ItemRack

Adds Name and Buyout Price sort columns to the auction house.

FuBar_InviteFu

Out of Mana bar.

Simple embeddable publish-subscribe implementation.

RBM_Hyjal

Adds predicted lists for spells while the user types

This is an add-on to block incoming guild/party/duel requests (except for friends/party/guild) (previously ASSBlock)

Announce which globule to kill during the Yor'sahj the Unsleeping encounter.

Compact scrolling vendor frame

Keeps track of your reagents.

StanceSetsFu

Display fails based on EnsidiaFails filtering options in Skada

Mail plugin for any DataBroker display.

LDB addon to manage your addons

Automatically converts a party to a raid when you attempt to zone into a raid zone without a raid.

Artifact power bar support for oUF layouts

Broker object for oQueue.

Changes the quest log back to how it was before Patch 6.0.