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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.
Note that saying "Solid needs a Snap installer" is like saying "the Web needs a Snap installer". Solid is a specification, a protocol determining how servers and apps can talk together. Anyone can implement a Solid server (there are several), and it's up to those servers to make installation easy. If you're able to contribute a Snap installer, I think the most viable server implementation to do that for at this time is https://github.com/solid/community-server