FVM is a very simple virtual machine wich runs a restrict set of Forth language
At this moment, FVM isn't yet running in Arduino, but as a interpreter in your computer (I started the project just now, give me a time :).
For compilind just go to src folder and run:
$ make
For running a example:
$ ./fvm sourcetest.fth
For running as a console:
$ ./fvm -c
Word Set
For a while FVM supports a very limited words set. I didn't make a list with all those words, but you can easily see them in builtin.h