I just did a Penetrating Cold Simulator to help our penetrating cold healers to familiarize faster with Anub (25h) Phase 3 (they are using Grid w/ GridStatusRaidIcons & GridPenetratingCold).
You can set the casting time of your heal (by example my Nourish is 1.1secs), the amount of heal by each cast, a key binding (between keys 1 to 4) and your raid icon.
The app will assume the rest of the healers are doing their work (healing their own PC, and keeping the raid around 30%).
Here is the link:
Btw, you don't need to be a facebook user nor being logged in. I mounted it there just because Facebook will never allow to have malicious code hidden in the app.