Open source. Open possibilities.

Bulma is a modern, Flexbox-based CSS framework distributed as a single CSS file with no JavaScript. It offers Sass sources for variable customization and works with any frontend stack.

A collection of bouncing DVD logo implementations across a wide variety of programming languages and platforms.

Priceline Design System is Priceline.com's open-source UI component library and design standard. It aims to unify interface patterns, speed design and development, and promote accessibility, internationalization, and responsive web design. It ships as the npm package pcln-design-system with Storybook docs and an MIT license.

Spruce CSS is an open-source, lightweight Sass-based CSS design system and framework offering variables, mixins, functions, few utility classes and CSS custom property theming with dark mode.

A comprehensive collection of over 6,100 free, MIT-licensed high-quality SVG icons designed on a 24x24 grid for web projects.

Helsinki Design System (HDS) is an open-source design system from the City of Helsinki, offering accessible React components, CSS styles and design tokens, alongside documentation and design resources.

GitHub Dark is a userstyle project that applies a dark theme to GitHub, reducing eye strain during coding sessions. It includes syntax highlighting themes for GitHub, CodeMirror, and Jupyter, and is designed to be used with browser extensions like Stylus.

Material Design for Bootstrap is a free UI kit offering 700+ components, themes, and templates for building responsive, mobile-first websites. Available for jQuery, Angular, React, and Vue under MIT license.

Bootstrap is a widely used open-source front-end framework for building responsive, mobile-first websites. It provides compiled and source CSS, JavaScript components, utility classes, and theming tools, with options for install via npm, Composer, NuGet and more.

A collection of 120 plain-text DESIGN.md brand design specifications reverse engineered from live production sites, letting AI coding agents generate on-brand UI. Each brand includes real colors, typography, components and guardrails plus a self-contained preview.html.

Tailwind CSS is an open-source utility-first CSS framework for rapidly building custom user interfaces. The repository points to tailwindcss.com for full documentation, GitHub Discussions for community help and ideas, and contributing docs for pull requests.

A professional front-end starter template for building fast, robust, and adaptable websites or web apps, refined over a decade by a large community.

ZeroWeb is an experimental cross-platform browser project written in Rust, providing both the embeddable ZeroWebView library and the full ZeroBrowser application. It features a self-developed core for DOM, CSS, layout, rendering, script runtime, storage, and security, serving as an AI-driven engineering experiment.

Simple Multi Apps - Kotlin is an open-source Android application featuring a modular collection of tools including a stopwatch, games, PDF reader, and video player.

TW Elements is an MIT-licensed component library for Tailwind CSS, offering 500+ interactive UI components and 117+ design blocks with dark mode support, theming options, and quick installation for personal and commercial use.

esbuild is an extremely fast JavaScript bundler for the web, built in Go. It natively supports JavaScript, CSS, TypeScript and JSX, bundles ESM and CommonJS, and offers tree shaking, minification, source maps, a local server, watch mode and plugins via CLI, JS and Go APIs.

Anime.js is a fast, lightweight JavaScript animation library with a powerful API for animating CSS properties, SVG, DOM attributes, and JavaScript objects.

Hyper is an open-source terminal emulator built on open web standards, offering an extensible, customizable command-line experience with plugins and themes.

Parcel is a zero-configuration web build tool that supports HTML, CSS, JavaScript and many asset types out of the box, with a built-in dev server, hot reloading, Rust-based compilation, caching, and automatic production optimization.

A curated directory of CSS frameworks organized by category, including base resets, classless frameworks, lightweight options, general-purpose frameworks, Material Design, utility-based, specialized, and stalled projects.