SoundSource - The sound control that should be built into MacOS
SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
Boom 3D - Audio enhancer with 3D surround sound
Cumulus - A SoundCloud player that lives in your menubar.
Noizio - Feeling that the noise of the big city is too much for you to bear?
Sleeve - Your currently playing track displayed right on your desktop