WowAce

Provides extended aura status settings.

Toggle addon configuration mode.

Automatically switches Profiles of addons when changing spec

Shows the number of battle resurrections you have and when the next one will become available during a boss encounter.

RainbowEnchants

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

Helps you see the Halion's Corporeality during phase 3

FuBar_AssistFu

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

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

Make your whole party/raid aware of whats happening during and after a readycheck

Changes the nameplates range and disables clamping to screen

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

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

BossWhisperer

WoWonid

View all your Auctions on any DataBroker display.

Flames anyone who lets his debuff expire on Malygos Phase 3

nRaidTracker

Data broker for keeping track of your Ankh cooldown.