Open source. Open possibilities.

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.

Flowbite is an open-source UI component library built on Tailwind CSS, offering interactive components like modals, dropdowns and datepickers driven by data attributes, with vanilla JS APIs, TypeScript types, RTL support and bindings for React, Vue, Svelte and Angular.

Prettier is an opinionated code formatter that parses code and reprints it with consistent rules, taking maximum line length into account and wrapping when needed. It can run in editors on save, pre-commit hooks, or CI.

WeasyPrint is a Python-based HTML/CSS to PDF rendering engine that helps developers generate professional documents like reports, invoices, and tickets from web markup.

Font Awesome is a widely used icon library and toolkit providing SVG, font, and CSS resources for designers and developers. Version 7 is the current release.

designlang is a Playwright-based CLI that reads a website's live DOM and extracts its design system: DTCG tokens, Tailwind config, Figma variables, shadcn theme, component anatomy, motion tokens, brand voice, WCAG contrast audits, and multi-platform emitters, plus MCP server and Chrome extension.

Transform is an open-source polyglot web converter that converts between many data and code formats in the browser. Built with Next.js, it offers per-route transformers and can be self-hosted.

Tabler is a free, MIT-licensed HTML dashboard UI kit built on Bootstrap 5, offering ready-made layouts, components and 120+ demo pages for admin panels, dashboards and web apps, with dark mode, RTL stylesheets, Sass sources and TypeScript types.

Lumen is a private and lightweight web browser with its own engine, written from scratch in Rust without using Chromium or WebKit wrappers.

A collection of app ideas for developers to practice coding, organized into Beginner, Intermediate, and Advanced tiers. Each project includes user stories, bonus features, and resources to guide building from scratch.

A curated English-language collection of bookmarks, resources, articles, and tools about design systems for developers, covering design tools, design tokens, pattern libraries, component testing, books, and talks.

styled-components is a CSS-in-JS library for React: write real CSS that is scoped automatically and delivered only when needed. One API covers server components, client components, streaming SSR and React Native; TypeScript types are built in, it is under 13kB gzipped and needs no build plugin.

Dioxus is a Rust fullstack app framework for building web, desktop, and mobile applications from one codebase, with zero-config setup, integrated hot-reloading, signals-based state management, server functions, and a bundling CLI.

Metis is a free MIT-licensed Bootstrap 5 admin dashboard template built with Alpine.js, Vite and SCSS. It ships responsive dashboard, user/product/order management, calendar, messages, reports, settings, auth and error pages, plus dark/light themes and a self-hosted asset setup.