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Bootstrap
The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
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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.
Fernosa is an upcoming open-source css library currently under development, we provide responsive components like footers, navbars, sidenav, forms, etc as well as utility classes, animated buttons, effects and a whole lot more. You just need to paste a few lines of html code and that's it! You dont need to spend hours working on components.