SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
Remote Mouse - Turn your smartphone into a wireless touchpad and keyboard now!
Cumulus - A SoundCloud player that lives in your menubar.
KDE Connect - Integrate Android with the KDE Desktop
Sleeve - Your currently playing track displayed right on your desktop
Monect - Make the best use of sensors on smart device to control PC, simulate steering wheel, game-pad...