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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.
This might suite your needs: https://scratch.mit.edu/
Have you seen GDevelop? It ticks all of your boxes
Godot: download, open - doesn't even need an installation.
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Hence, a higher number means a more popular project.