CSS frameworks are libraries built to make your life as frontend developer easier by including a mass amount of styling modules and tools.
Bootstrap is an open source toolkit for developing with HTML, CSS, and JS. Quickly prototype your ideas or build your entire app with our Sass variables and mixins, responsive grid system, extensive prebuilt components, and powerful plugins built on jQuery.
Tailwind is a utility-first CSS framework for rapidly building custom designs. Tailwind CSS is a highly customizable, low-level CSS framework that gives you all of the building blocks you need to build bespoke designs without any annoying opinionated styles you have to fight to override.
Foundation is a family of responsive front-end frameworks that make it easy to design beautiful responsive websites, apps and emails that look amazing on any device.
Materialize is a modern responsive front-end framework based on Material Design
Semantic UI is a development framework that helps create beautiful, responsive layouts using human-friendly HTML.
Bulma is a free, open source CSS framework based on Flexbox
UIKit is a lightweight and modular front-end framework for developing fast and powerful web interfaces.
PureCSS is a set of small, responsive CSS modules that you can use in every web project.
Ant Design is a design system with values of Nature and Determinacy for better user experience of enterprise applications
Tachyons is a growing library of open source components written in static html that are easy to use as is, customize with your own theme, or port to a templating language.
Primer is the CSS implementation of GitHub’s Primer Design System