Tape It - App for songwriting & audio recording.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Songcraft.io - A platform for songwriters to write, organize & collaborate.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
RiffShare - Write down a musical riff, send to band members, collaborate
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android