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subdivide
Split pane layout system for React. Each pane can be subdivided and any widget assigned to any pane allowing users to define layout.
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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.
I'm teaching myself react/html/css, etc. For the learning experience, I want to write my own container that acts like https://github.com/philholden/subdivide which is inspired by blender. I was playing with raw html and getting children to stack with a given % to get an idea of what I would need my React to generate. So for example, I did this for horizontal: