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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.
Well w/o setting up your own server, it can hardly get any better. But if you go down the route of your own server, maybe check https://haraka.github.io/. It's plugin based so you should be able to write specific plugin for your purposes.
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Hence, a higher number means a more popular project.