Godot Engine – Multi-platform 2D and 3D game engine

VS Code in the browser

Screenshots with JavaScript

Cross-Platform React Native UI Toolkit

A set of 170+ Bootstrap based design blocks ready to be used to create clean modern websites.

Tiny cross-platform webview library for C/C++. Uses WebKit (GTK/Cocoa) and Edge WebView2 (Windows).

🎨 Color Pickers from Sketch, Photoshop, Chrome, Github, Twitter & more

Motion design editor for the web

✒7000+ Material Design Icons from the Community

🧙 Valtio makes proxy-state simple for React and Vanilla

Drag and drop page builder library written in vanilla javascript without dependencies or build tools.

xkcd styled chart lib

🥢 A minimalist-friendly ~2.1KB routing for React and Preact

🍞🎨 Full-featured photo image editor using canvas. It is really easy, and it comes with great filters.

Petition to open source Flash and Shockwave spec

A command-line tool to generate, analyze, convert and manipulate colors

A component toolkit for creating live-running code editing experiences, using the power of CodeSandbox.

Cinder is a community-developed, free and open source library for professional-quality creative coding in C++.

The next generation Javascript WYSIWYG HTML Editor.

A full open source 3D graphics editor in the browser, with scene editor, coding pad, graph editor, virtual file system, and many features more.

2D JavaScript Physics Engine

A React tiling window manager

A JavaScript implementation of Git.

a small scripting language for the web

Browsix is a Unix-like operating system for the browser.

macOS Quick Look extension for Markdown files.

Neocities.org - the web site. Yep, the backend is open source!

A cyber-physical programming environment

Glisp is a Lisp-based design tool that combines generative approaches with traditional design methods, empowering artists to discover new forms of expression.

The original IBM PC and other machine emulations in JavaScript