DreiKugeln (German (with a suppressed blank) for "Three Balls") is a numerical simulation of the three-body problem, i.e. the non-relativistic movement of three mass points in an infinite otherwise empty three-dimensional space under the pure influence of their mutual gravitation.
The sum of their momenti (I read that English has no plural for the noun "momentum", so I had to borrow it from Latin) is zero, such that their gravitational center is fixed at a point I'd like to call the origin. You look at the scene like through a camera pointed at this origin, also staying at a fixed location.
I wrote DreiKugeln originally in 2021 for my private amusement, then in 2026 decided to publish it, with some enhancements and corrections.
The only known way of obtaining DreiKugeln is to download it from here.
… is pretty straight-forward if you take a look at the settings and the application menus. At the bottom of the main window is a status bar displaying, in this order, the current speeds, accelerations, and distances from the origin of the balls, as well as their mutual distances and the minimal value of the latter numbers reached during the current simulation.
Maybe worth noting is that the radius of the disk visualizing a mass point is proportional to the cubic root of its mass.
First published version.
… is available here, so you can check that the program does not try to raid your refrigerator.