That’s pretty neat, especially the real time aspect and easy tweaking of settings.
Addon… don’t think so. I am going to guess it was not made in python. Also I am guessing that a GPU accelerated voxelizer is something we won’t have access to in the Blender python API any time soon. Something like this would have to be integrated with Blender, unless we saw the creation of a proper C/C++ plugin API. Also there are the GPL issues that always come up.