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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.
> Yes WordPress is bad. I should use a static site generator with nearly free hosting anyways
I operate a few blogs running Bludit[0]. I do this since WP is highly complex. I like to keep it simple. But Wordpress is handy if you're a control freak and love to tinker.
Why do you want a read-only filesystem for WP? I have several WP installs running under XAMPP, and if I want to, I could have a hundred, or...a thousand for testing purposes.
[0] https://www.bludit.com/