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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.
But, it took a ton of time and effort to get the new https://react.dev site out (and it was basically just Dan doing all the content writing). Hopefully the docs will be updated faster to reflect how RSCs work... but given that the implementations are still fresh and in progress, it's understandable that there aren't docs yet.
You can. You would just need to put in the work to go look at the (still entirely undocumented) React core library pieces of RSCs, and figure out how to integrate those into your bundler and router of choice. Other devs are already doing that, such as https://github.com/dai-shi/wakuwork
Check compatibility of React with web components: https://custom-elements-everywhere.com/ It's not directly because of jsx, but because of synthetic "let's make it up" approach of React.