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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.
Are there things that make lemmy difficult? Yes, but they're rapidly being solved and extremely minimal, other than that issue tracker, the other thing that might stop you is that some lemmy instances require a message and approve signup, this is because they widely aren't monetized and are run by volunteers with no intention of ever monetizing. Neither of these things are real blockers to normal human adoption, and neither of them are long-term issues.