JavaScript animation engine

Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render it before sending.

Phaser is a fun, free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.

Helping you select a JavaScript framework - Todo apps for React.js, Angular, Vue and many more

Ace (Ajax.org Cloud9 Editor)

JavaScript library for all kinds of color manipulations

JavaScript parser / mangler / compressor / beautifier library for NodeJS

JavaScript library for HTML5 & CSS3 time sheets

🐤 The friendly full-stack language

Sublime-like terminal-based text editor

Experimental Terminal platform built on WebKit + node.js. Currently only for Mac and Windows, though the prototype works 90% in any WebKit browser.

A lightweight library that provides tools for organizing asynchronous code

Constructive solid geometry on meshes using BSP trees in JavaScript

Command-line utility-belt for hacking JSON and Javascript.

Unsurprising JavaScript - No longer active

Open Source HTML5 Puzzle Game Engine

Small functional language that compiles to JavaScript.

An ECMAscript framework to compile and run Lua code, allowing Lua to run in a browser or in Flash

A Lisp for Lua and JavaScript

Web-based Turbo Pascal compiler.

A cross-platform mobile framework with the freedom to build great UIs.

The language of Art

A powerful, easy-to-use, and easy-to-read programming language for the future.

A small library to enable pattern matching in javascript and coffeescript

Share your blocks and subscribe to others'

GorillaScript is a compile-to-JavaScript language designed to empower the user while attempting to prevent some common errors.

Concurrency and Metaprogramming for JS

C to WebAssembly compiler

evented I/O for v8 javascript

Minimal self-hosted JavaScript compiler in 1k lines of code