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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.
An option is to do what I've done with my lang, Claro, getting the compiler and/or REPL hosted online on Riju. The maintainer is a very helpful guy that gave thorough docs you can follow for getting your language added. Check out https://riju.codes for the top level thing, and check out https://riju.codes/claro for an example what it looks like for a side project language to run there. Only issue there is you shouldn't expect regular redeploys as you continue working on the language. I just ask nicely every 3 or 4 months when I have some big change I'd like represented there and he redeploys.