Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Flowkey - The easiest way to learn piano with your iPhone or iPad
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
Yousician - Learn to play music at home, at your own pace
Trelby - The free, multiplatform, feature-rich screenwriting program!
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.