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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.
Translate the URLs too in my opinion is a killer SEO feature but, at the moment, is not so simple support it in a Next.js site: there are many solutions which vary by your data source (headless CMS, file system based, ...) but the important thing is that in your final build you'll have each page collected for its localization code:
First of all, I 💘 the jamstack architecture that solves so many problems in such simple ways... and that is why in this context I speak of a static site: all pages are pre-generated at build time (known as SSG).