This has been posted time and time again.

Please note that the last commit was in Jan 2012 (perhaps add [2012] to the title?), and I believe it is far from usable in its current state.

I found https://news.ycombinator.com/item?id=8029221, at least, so yes, the current post is a dupe.

Also worth seeing - http://armpit.sourceforge.net/

Forth or Lisp(-ish) are still my "OS" of choice on embedded systems. So much more productive.