Best Open Source css Libraries
A curated list of the most popular GitHub repositories tagged with css. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.
#1twbs/bootstrap
The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
#2Chalarangelo/30-seconds-of-code
Coding articles to level up your development skills
#3electron/electron
:electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS
#4microsoft/Web-Dev-For-Beginners
24 Lessons, 12 Weeks, Get Started as a Web Developer
#5tailwindlabs/tailwindcss
A utility-first CSS framework for rapid UI development.
#6florinpop17/app-ideas
A Collection of application ideas which can be used to improve your coding skills.
#7animate-css/animate.css
🍿 A cross-browser library of CSS animations. As easy to use as an easy thing.
#8FortAwesome/Font-Awesome
The iconic SVG, font, and CSS toolkit
#9thedaviddias/Front-End-Checklist
🗂 The perfect Front-End Checklist for modern websites and meticulous developers
#10juliangarnier/anime
JavaScript animation engine
#11h5bp/html5-boilerplate
A professional front-end template for building fast, robust, and adaptable web apps or sites.
#12necolas/normalize.css
A modern alternative to CSS resets
#13prettier/prettier
Prettier is an opinionated code formatter.
#14jgthms/bulma
Modern CSS framework based on Flexbox
#15Asabeneh/30-Days-Of-JavaScript
30 days of JavaScript programming challenge is a step-by-step guide to learn JavaScript programming language in 30 days. This challenge may take more than 100 days, please just follow your own pace. These videos may help too: https://www.youtube.com/channel/UC7PNRuno1rzYPb1xLa4yktw
#16ColorlibHQ/AdminLTE
AdminLTE - Free admin dashboard template based on Bootstrap 5
#17vercel/hyper
A terminal built on web technologies
#18parcel-bundler/parcel
The zero configuration build tool for the web. 📦🚀
#19yangshun/front-end-interview-handbook
Front End interview preparation materials for busy engineers (updated for 2026)
#20styled-components/styled-components
Visual primitives for the component age. Use the best bits of ES6 and CSS to style your apps without stress 💅
#21tabler/tabler
Tabler is free and open-source HTML Dashboard UI Kit built on Bootstrap
#22saadeghi/daisyui
🌼 🌼 🌼 🌼 🌼 The most popular, free and open-source Tailwind CSS component library
#23evanw/esbuild
An extremely fast bundler for the web
#24Dogfalo/materialize
Materialize, a CSS Framework based on Material Design
#25DioxusLabs/dioxus
Fullstack app framework for web, desktop, and mobile.
#26layui/layui
一套遵循浏览器原生态开发模式的 Web UI 组件库。
#27AllThingsSmitty/css-protips
⚡️ A collection of tips to help take your CSS skills pro 🦾
#28IanLunn/Hover
A collection of CSS3 powered hover effects to be applied to links, buttons, logos, SVG, featured images and so on. Easily apply to your own elements, modify or just use for inspiration. Available in CSS, Sass, and LESS.
#29postcss/postcss
Transforming styles with JS plugins
#30qianguyihao/Web
千古前端图文教程，超详细的前端入门到进阶知识库。从零开始学前端，做一名精致优雅的前端工程师。
#31Advanced-Frontend/Daily-Interview-Question
我是依扬（木易杨），公众号「高级前端进阶」作者，每天搞定一道前端大厂面试题，祝大家天天进步，一年后会看到不一样的自己。
#32Asabeneh/30-Days-Of-React
30 Days of React challenge is a step by step guide to learn React in 30 days. These videos may help too: https://www.youtube.com/channel/UC7PNRuno1rzYPb1xLa4yktw
#33haizlin/fe-interview
前端面试每日 3+1，以面试题来驱动学习，提倡每日学习与思考，每天进步一点！每天早上5点纯手工发布面试题（死磕自己，愉悦大家），6000+道前端面试题全面覆盖，HTML/CSS/JavaScript/Vue/React/Nodejs/TypeScript/ECMAScritpt/Webpack/Jquery/小程序/软技能……
#34biomejs/biome
A toolchain for web projects, aimed to provide functionalities to maintain them. Biome offers formatter and linter, usable via CLI and LSP.
#35emotion-js/emotion
👩🎤 CSS-in-JS library designed for high performance style composition
#36thedaviddias/Front-End-Performance-Checklist
🎮 The only Front-End Performance Checklist that runs faster than the others
#37less/less.js
Less. The dynamic stylesheet language.
#38picocss/pico
Minimal CSS Framework for semantic HTML
#39arthurspk/guiadevbrasil
Um guia extenso de informações com um vasto conteúdo de várias áreas para ajudar, agregar conhecimento e retirar dúvidas, nesse guia você encontrará tudo que necessário para qualquer carreira relacionada a tecnologia.
#40ionic-team/capacitor
Build cross-platform Native Progressive Web Apps for iOS, Android, and the Web ⚡️
#41grab/front-end-guide
📚 Study guide and introduction to the modern front end stack.
#42sparanoid/chinese-copywriting-guidelines
Chinese copywriting guidelines for better written communication／中文文案排版指北
#43aniftyco/awesome-tailwindcss
😎 Awesome things related to Tailwind CSS
#44thomaspark/bootswatch
Themes for Bootstrap
#45astrit/css.gg
700+ Pure CSS, SVG & Figma UI Icons, 6000+ glyphs, patterns, colors and layouts.
#46StylishThemes/GitHub-Dark
:octocat: Dark GitHub style
#47dunovank/jupyter-themes
Custom Jupyter Notebook Themes
#48swyxio/spark-joy
✨😂 2000+ ways to add design flair, user delight, and whimsy to your product.
#49uncss/uncss
Remove unused styles from CSS
#50mdbootstrap/material-design-for-bootstrap
Important! A new UI Kit version for Bootstrap 5 is available. Access the latest free version via the link below.