WowAce

Calculates incoming damage avoidance and mitigation

Shows Status Bars that you can drag around and group up for your cooldowns

Adds a couple of graph displays to Skada.

A clone of the FailBot mod. Announces raid member failures such as "Player1 fails at frogger"

Automatically generate and announce optimal spirit totem assignments during the Gara'jal encounter in Mogu'shan Vaults.

Tracking and ranking of dps/hps in a guild.

Keeps track of HoTs, DoTs, Buffs and Cooldowns. With audio and text alerts to refresh them.

Death reports

Good looking, smoothy and helpful nameplates

Disease Tracker for Death Knights.

Add in keybindings to place raid marks on mouseover, or the target if there is no unit being moused over

Sheppard

A Data Broker display for combat statistics.

Heads Up Display with Player and Target Info

LDB data source for Combat Tracking

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

Simple and rich Death Knight rune customizations

Aura alarm.

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

Information display for Hunters.