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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The dragon curve example is a lot more complicated than the simplest definition, which is a hint. I don't even know exactly what | or [ or ] are supposed to do here.
Here's a version in Go instead: https://github.com/deosjr/GenGeo/blob/master/gen/lindenmayer...
The mobile version can use a tweak, but overall is a pretty nice project.
I while back i was trying to come up with interesting rules to generate fractals and em up creating a genetic algorithm with you as the evaluator.
https://github.com/victorqribeiro/randomFractal