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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.
* Swift Libraries are now underway thanks to @satishbabariya [2]
We still have a long way to go for mobile support, but the Apple logins is a big one. If you ship an app to the App Store with any third-party logins, you're required to enable Apple logins as well. While this sounds like a bit of over-reach, it's actually quite cool - if you use Apple login they obfuscate your email so that the 3rd party app don't get access to your personal data. Quite nice!
[0] CSV: https://github.com/supabase/postgrest-js/pull/187