Selenium : Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testin...
PhantomJS : PhantomJS is a headless WebKit with JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas...
SlimerJS : A scriptable browser for Web developers
Babel : Babel will turn your ES6+ code into ES5 friendly code, so you can start using it right now without waiting for browser support.