Orbit is a program is one I made around 2003-2004 which simulates planet type objects as they fly around the screen under the influence of gravity. You can add as many objects as you like and adjust their position, mass or velocity to create some pretty neat interactions. It can also be run fullscreen.
To download this program you’ll need to have the Visual Basic 6 runtimes. If you get an error when trying to run the program you can download the runtimes here.
Click here to download v1.0 released 10/3/2006.