This looks like a cool personal project, built by the author as a learning experience, with a convenient API to manipulate the machine that's being simulated. If that doesn't tell you enough about why it exists, then I don't know what to tell you besides "nothing to see here".

You see, that's where you're way off base. Not everything shown here is going to be a 'product'; people often like to learn by doing, and showing what they create.