CSS GitHub Repositories (2026) · Open Source Tools

Write an app once. It runs natively on the web, macOS, iOS, and Linux, and an AI agent can build it, run it, see it, and test it on every one of them.

A set of over 6200 free MIT-licensed high-quality SVG icons for you to use in your web projects.

A utility-first CSS framework for rapid UI development.

🌼 🌼 🌼 🌼 🌼  The most popular, free and open-source Tailwind CSS component library

Build cross-platform Native Progressive Web Apps for iOS, Android, and the Web ⚡️

Enlightened library to convert HTML and CSS to SVG

Free and open source admin dashboard UI kit built on Bootstrap: 100+ pages, 6,000+ icons, dark mode, RTL.

:electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS

Fullstack app framework for web, desktop, and mobile.

Coding articles to level up your development skills

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

Lingo - Interactive platform for language learning.

Restyle any website

Modern JavaFX CSS theme collection with additional controls.

An extremely fast CSS parser, transformer, bundler, and minifier written in Rust.

A toolchain for web projects, aimed to provide functionalities to maintain them. Biome offers formatter and linter, usable via CLI and LSP.

❴ ● ❵ GSS — GPU Style Sheets. A CSS-like language for 3D scenes: selectors, the cascade, nesting, keyframes and transitions, compiled into one raymarching shader for WebGPU and WebGL2. No Three.js, no meshes. Playground, VS Code extension, and a <gss-scene> tag for any page.

The text editor designed to make coding as simple and fun as playing a video game

A professional front-end template for building fast, robust, and adaptable web apps or sites.

Plug-and-play web font optimization and configuration for Nuxt apps.