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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.
Tailwind CSS is the most popular open-source CSS framework with a utility-first methodology for the class names, meaning that instead of an OOCSSS approach like btn and btn-lg you will instead use utility classes for paddings, margins, colors, and more.
Flowbite is a popular and open-source component library built on top of the Tailwind CSS framework featuring interactive elements such as dropdowns, navbars, modals, and other more complex components that can help you save time when building websites with Tailwind CSS.