Rhino is an implementation of JavaScript written entirely in Java. The source code for Rhino is available under the NPL. e Rhino project was started at Netscape in Fall 1997. At the time, Netscape was planning to produce a version of Navigator written entirely in Java and so it needed an implementation of JavaScript written in Java. When Netscape stopped work on “Javagator”, as it was called, somehow Rhino escaped the axe (rumor had it that the executives “forgot” it existed). Since then, a couple of major companies (including Sun) have licensed Rhino for use in their products and paid Netscape to do so, allowing us to continue work on it. Now Rhino is planned to be part of several server products from Netscape as well.