Codebot - Free and open source (MIT license) IDE focused on game development.
Codebot is a code editing program equipped with built-in tools to help you make your game faster (read full thoughts here). Developing a game is much more than just coding, you have to tweak art, build levels, convert files, find assets/extensions, read docs about building and publishing, and so on. Under the hood Codebot is built with JS/HTML/CSS. When used as a native app, Codebot uses Node Webkit.
mocha : ^3.5.3
puppeteer : ^0.11.0