Rhino

Mozilla Java/JVM-based JavaScript

http://www.mozilla.org/rhino/

Most people who have used JavaScript before have done so by adding scripts to their HTML web pages. However, Rhino is an implementation of the core language only and doesn't contain objects or methods for manipulating HTML documents. http://developer.mozilla.org/en/docs/Rhino_Overview

It is intended to be used in applications, hence there is no support for the browser objects that are commonly associated with JavaScript. http://en.wikipedia.org/wiki/Rhino_(JavaScript_engine)

for browser see Spider Monkey