WowAce

SmartyCat

NCHide

Draws 3D portraits for main units that can be moved or resized at will.

KC_PlayerFramePlus

Shows a frame to track your debuff on Malygos in phase three.

Library for tracking cooldowns of other players

Dailies Quest Tracker

Helps you keep track of your experience.

Overlays Archaology digsite icons on the flightmap

Client for MagicDKP which handles standby calls and bidding on items.

PerfectTargets

Simple oRA3 Maintank Target Frames, based on oUF

PartyToGo

RaidHelper

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

Shows a nice Soulstone Monitor.

RapidCast

SalvationKiller

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

KivinConsoleXP