CSS GitHub Repositories (2026) · Open Source Tools

📖 The power of CSS typesetting, right at your fingertips.

This repository contains general data for Web technologies

CSS selectors complexity and performance analyzer

C# library that moves your stylesheets to inline style attributes, for maximum compatibility with E-mail clients.

NHS.UK frontend contains the code you need to start building user interfaces for NHS websites and services.

:wink: Lightweight pure CSS tooltip for the greater good

Compress 🗜️

Cross-platform GPU-oriented C++ application/game framework

CSS preprocessor.

Go parsers for web formats

A free UI toolkit based on some common libraries for building beautiful responsive website, compatible with Bootstrap v5.

A platform to connect and support NGOs, charities and you to build a better tomorrow.

A lightweight runtime CSS/JavaScript file minification, combination, compression & management library for ASP.Net Core

JSX Zero-Runtime UI Styling Library

Paged HTML Rendering Library

This website uses Browserslist and Can I Use to display the compatible browsers for a browsers query.

Advanced yet easy to use escaping library for Java

Citizen Intelligence Agency. Open-source intelligence platform analyzing Swedish political activities using AI and data visualization. Tracks politicians, government institutions, and parliamentary data, offering detailed insights, performance metrics, and advanced analytics.

A fully functional and flexible typewriter mixin for SCSS, with Less and Stylus support coming soon! Typed.css supports multiple strings, multi-line strings, variable speeds, per-string styling, animated caret (blinking insertion cursor), directional type-pausing, and much more. It's even accessible! ✨

A Twig extension to allow inlining CSS