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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.
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react-entity-component-system
Entity Component System for React to make games or other interactive components.
If you want a performant ECS implementation, how about giving my library a try? It's also really simple, ergonomic, and strongly typed.
What if you combine this library with the official react-reconciler package and make a custom React renderer for ECS?
Looks like someone has already tried bringing ECS into React, though not with a low-level implementation of react-reconciler.