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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.
Yea but I'm not creating a library or a framework, I'm just creating isolated web components which are self contained, these components have no knowledge of each other and can be used in any framework you choose. Just basic custom html tags which rely on the web components standard. I posted the link above, feel free to check it out: https://github.com/newk5/stak-components
Take a look at github's web components: https://github.com/github/github-elements it's similar. There is no library there, it's just a collection of separate components, the only difference there is that their collection is split into different github repositories, I could have done the same, but I chose to put them all into the same github repository.