Our great sponsors
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nextra
Simple, powerful and flexible site generation framework with everything you love from Next.js.
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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.
Seems to be Nextra [0] according to the GitHub repository you can find when following the link to the source in the upper right corner of the website.
[0] https://nextra.site/
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.