WowAce

Historian

Reverse Engineering will drill down and search your tradeskills for their elements

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

Dailies Quest Tracker

ChatAssist2Options

FuBar_AEmotesFU

Marks the Balcony adds in the Horridon encounter

User-configurable protection for your inventory. Automatically buys back mistakenly sold items.

Audible Alerts for self-gain, self-lost, any-gain, all-lost of statuses.

SanityBags

KivinSpamGuard

Shows more recipies in the profession window.

Warnings about tanking specific abilities

Protractor

Fail display for Recount based on EnsidiaFails filtering options

EnvenomX

Resizes Blizzard raid frames, and adds additional options.

Shift-clicking on a user name in chat shows a tooltip with their whois information.

Keeps track of people who have recently sent you messages.

EasyDKP