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.

Tailwind is different from frameworks like Bootstrap, Foundation, or Bulma in that it's not a UI kit.

Foundation is an easy to use, powerful, and flexible framework for building rapid prototypes and production code on any kind of device.

Simple. Built on open source. The responsive front-end library based on Google's Material Design.

Over 400+ professionally designed, fully responsive, expertly crafted component examples you can drop into your Tailwind projects and customize to your heart’s content.

A set of small, responsive CSS modules that you can use in every web project.

Material UI is an open-source React component library that implements Google's Material Design. It's comprehensive and can be used in production out of the box.

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. Skeleton is built on three core principles:

Eva Design System is a free and open-source, customizable design system. Available for Sketch with Mobile and Web component libraries.

This project's goal is to be able to create a fully accessible material design styled website using React Components and Sass.

Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.

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.