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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 most usable software to extend is this one https://github.com/g200kg/zoom-ms-utility/, but it's about 2000 lines of Javascript inside an index.html, with no tests and a strong coupling between UI and functionality. I've hacked my changes into an even worse fork of this project (~5000 lines of unstructured JS 😱) as a proof-of-concept, and I'm starting to be able to navigate this code a little; it works, and I'd like to bring this project into a more maintainable state.