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ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
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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.
Back in the day, .Net had webforms which was basically winforms - that *was* the easiest path, now there's asp.net MVC or Core (for a api only) where you would still need to build the front end separately said.
This is exactly what I'm doing this week in bootcamp, I'm using node-postgres, if you're familiar at all with JavaScript then you can check it out here