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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.
Thanks, that seems like a very good advice. I have now actually managed to get Katago to work with Ogatak (step by step instructions can be found here), and I am slowly getting somewhat of a grip by watching youtube videos of varying quality. But it is a very piecemeal approach and I would really love to have a more systematic way of learning the ropes. But like I said, overall I am of course just super happy that there are these riches out there!