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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.
I wouldn't put it this way. To me it looks like an alternative to MDX -- without the JSX syntax. It's definitely more inspired by Jinja2/Nunjucks syntax-whise. Having worked on documentation sites similar in scale as compared to the Stripe docs I can definitely see a benefit of using that over MDX. Especially if Markdoc doesn't have as many strange behaviors as MDX.
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.