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headlessui
Completely unstyled, fully accessible UI components, designed to integrate beautifully with Tailwind CSS.
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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.
For the logic I use https://headlessui.dev/ which handles pretty much everything I've ever needed almost. I try to do my due diligence when coding handling accessibility, but honestly I just run a accessibility report when I'm done with a component or page and fix what It tells me. I also purchased Tailwind UI to really only use as a "best practices" and a guide to creating my own components. It just shows me how the creators of the Tailwind project intended for it to be used and such.