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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.
Notesnook is multi-platform too but it's pretty new, so may not have all the features you want. It's quite snappy though. I'm mentioning it only because I had a positive discussion about its future with the developer a while ago on this subreddit. Though I haven't seen updates about new features since then. So you'll have to do your own due diligence for this one.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.