Congrats, this is really impressive. Hopefully I'll have some free time in the next few months to try it out. Never used Forth before, so I might give it a bit of a go sometime soon. Any good further resources other than the wiki page?
This particular Forth is based on the eForth dialect. There isn't a ton of documentation that I'm aware of, but it's almost entirely self-hosted, and if you can read Forth the source is fairly short and well-commented: http://www.baymoon.com/~bimu/forth/
For a gentle introduction to Forth I recommend Starting Forth (http://www.forth.com/starting-forth/) followed by Thinking Forth (http://thinking-forth.sourceforge.net/), both by Leo Brodie.