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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.
Why someone pay for this, when there is already a tried and tested lib used by big companies there: :link
Also, mixing GPL and commercial license only good, when there are some advanced features you're providing in commercial version. IMO, you can release a free basic version for commercial project too like this famous guy has done for their libs: https://masonry.desandro.com/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.