You could use GoJS to make one: https://gojs.net/latest/index.html https://gojs.net/latest/index.html (I make GoJS, a diagramming library, but it presumes noth

You could use GoJS to make one: https://gojs.net/latest/index.html https://gojs.net/latest/index.html (I make GoJS, a diagramming library, but it presumes nothing about "looks", which can be modified arbitrarily)