The Newtonator is an LV2 soft synth that uses a unique algorithm based on simple ideas of velocity and acceleration to produce some unpredictable sounds. Being an LV2 synth, it only works on Linux, and at the moment there is only an LV2 synth plugin; there is no stand-alone version.
If you want to run this synth, you'll need to download the source and compile it. There are instructions in the README file included in the source. You will need CMake installed in order to compile.