RingoJS is a JavaScript runtime written in Java based on Mozilla Rhino. It adds a number of features to Rhino that make it suitable for real-world, large-scale application development: A fast, auto-reloading, and CommonJS-compliant module loader. A rich set of modules covering I/O, logging, persistence, development tools and much more. Scalable HTTP server based on the Jetty project. Support for CommonJS packages to install or write additional software components.