Material UI: Comprehensive React component library that implements Google's Material Design. Free forever.

Realtime application framework (Node.JS server)

Quill is a modern WYSIWYG editor built for compatibility and extensibility

The open source frontend for GitBook doc sites

A beautiful replacement for JavaScript's "alert"

Etherpad: A modern really-real-time collaborative document editor.

Run compilers interactively from your web browser and interact with the assembly

Redis Node.js client

Brotli compression format

Play with neural networks!

A JavaScript library aimed at visualizing graphs of thousands of nodes and edges

Winamp 2 reimplemented for the browser

The official MongoDB Node.js driver

Next-gen, highly customizable content editor for the browser - based on React and written in TypeScript. WYSIWYG on steroids.

Cron for NodeJS.

The Bosque programming language is an experiment in regularized design for a machine assisted rapid and reliable software development lifecycle.

Goodbye CoffeeScript, hello JavaScript!

Perseus is Khan Academy's exercise question editor and renderer.

JavaScript library for realtime, browser-based video and audio editing

React component for rendering documentation from your specification in real-time in the browser. It also provides a WebComponent and bundle for Angular and Vue

Tetris in TypeScript