This is another one of those projects that ended up taking a great deal more of my time than I originally intended. I kept trying to add new features to the program, and unfortunately these new features almost always required modifications to a (ever more convoluted) graphical user interface. I finally retired the GUI version of the project and rebuilt it with the ability to read text files describing the solar system to be simulated. Both versions are here so you can use whichever one appeals to you. A couple of screenshots are below.
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