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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.
Looks like they plan to open it. From the FAQ section of README (https://github.com/stackblitz/webcontainer-core#faqs):
> Is there a developer API?
It looks like they're loading in MDX (Markdown) for a lot of the pages
There are quite a few "static-site generator" templates that are easy to setup and customize and many of them are free to use! If I had to guess, I think they're using VitePress [1] here. Nextra [2] is also good for this kind of a website.
[1] https://vitepress.vuejs.org/
[2] https://nextra.site/