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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.
constexpr.js is a tool that allows you to execute parts of javascript in your website before deployment. You can use it like a static site generator, as I do for this website. It's different from SSG's like Jakyll in that it doesn't force you to learn a dedicated domain specific language. There already exists a dedicated languages for dealing with DOM and webpages, javascript. With constexpr.js, you use javascript and usual DOM manipulation methods to generate the website. The whole browser runtime is available at your disposal when generating sites with constexpr.js.