SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
Unity - The multiplatform game creation tools for everyone.
Cumulus - A SoundCloud player that lives in your menubar.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Sleeve - Your currently playing track displayed right on your desktop
Blender - Blender is the open source, cross platform suite of tools for 3D creation.