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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.
Have you tried MarkText? If it's not in the repos, it's available as a Flatpak. It supports realtime preview as you type, and not in a separate pane. https://github.com/marktext/marktext
Maybe Ghostwriter or Apostrophe?
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.