Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Synthesia - A fun way to learn how to play the piano.
Celtx - Celtx is a scriptwriting software platform with applications in a wide range of mediums but that specializes in helping screenwriters.
Playground Sessions - Online piano learning game.
Trelby - The free, multiplatform, feature-rich screenwriting program!
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.