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stencil
A toolchain for building scalable, enterprise-ready component systems on top of TypeScript and Web Component standards. Stencil components can be distributed natively to React, Angular, Vue, and traditional web developers from a single, framework-agnostic codebase.
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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 a designer just here to learn, but the dev on my team really likes Knockout JS. It seems like a good way to plugin some of the same functionality without it being overkill.
It's incredibly niche but I really like Ionic's StencilJS framework: https://stenciljs.com/
vueuse: https://vueuse.org/