1. Bootstrap is a open-source collection of tools for creating browser sites and applications. It contains HTML and CSS-based design templates for typography, forms, buttons, charts, navigation and other interface components, as well as optional JavaScript extensions.
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  2. A modern CSS framework based on Flexbox.
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  3. Foundation is an easy to use, powerful, and flexible framework for building rapid prototypes and production code on any kind of device.
  4. Vuetify is a semantic component framework for Vue. Build amazing applications with the power of Vue and Material Design and a massive library of beautifully crafted components.
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  5. Tailwind is different from frameworks like Bootstrap, Foundation, or Bulma in that it's not a UI kit. It doesn't have a default theme, and there are no built-in UI components.
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    • FreeOpen Source
    • Online
    • Self-Hosted
    • CSS
    • JavaScript
    • Vue.js
    Element, a Vue 2.0 based component library for developers, designers and product managers.
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  6. Little Widgets is a collection of beautifully designed HTML website widgets and popups. It’s coded, responsive, animated and ready to use on your website.
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  7. Skeleton is a small collection of CSS & JS files that can help you rapidly develop sites that look beautiful at any size, be it a 17" laptop screen or an iPhone.
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  8. Single-file libre CSS frameworks as design languages for all kinds of projects.
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    • Online
    • Self-Hosted
    Over 400+ professionally designed, fully responsive, expertly crafted component examples you can drop into your Tailwind projects and customize to your heart’s content.
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  9. Lightweight, responsive and modern CSS framework for faster and extensible development.
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  10. Wing is a minimal CSS framework that provides a base of styles, and you don't even need to learn a gazillion class names, all of your elements will be styled automatically. Wing is only 4kb minified.
  11. The Angular Material project is an implementation of Material Design in Angular.js. This project provides a set of reusable, well-tested, and accessible UI components based on the Material Design system.
    • FreeOpen Source
    • Self-Hosted
    Create fast loading, highly readable, and 100% responsive interfaces with as little css as possible.