FIJI ForthIsh Java Interpreter, is written in Java and comes with full GPL’ed source. Running either at a command line or in an AWT window, FIJI accepts a syntax akin to the Forth programming language and uses a reference stack to push and pop all params to its functions. You can create Java objects and call methods on them from the FIJI stack. FIJI is very preliminary, quite incomplete and will be changing all the time. But such as it is, it works and has been tested on Linux Blackdown JVM 1.1.7a, VM/ESA JVM 1.1.4, and Windows/Sun JVM 1.1.7a.