This app for handbell change ringing. The app allows one to use an iPhone as a handbell. Given enough iPhones, two per person, a band of ringers can practice even if they do not (yet) have a set of real handbells. Can also be used in conjunction with Ringing Room, Abel, and Muster. Works on iPhone 5 or more recent models.
The app can also show how differently tuned bells (key and temperament) might sound like when different methods are rung.