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storybook
Storybook is a frontend workshop for building UI components and pages in isolation. Made for UI development, testing, and documentation.
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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.
1 - A Godot playground like babylon.js playground where you can code in GDScript and get results in a player. Some scene templates are provided to start quickly. 2 - Godot project share and explorer. Share your project through an inspector like storybook.js. The people who see them can inspect some aspects like code, shader, and other configurations.
I think if you can improve upon existing playground functionality then you could be on to something. There’s also Tumeo.