One of Carl's other project - She is frozen in time, what a beauty she is. The clones of her are nothing close. Carl Sassenrath is an outstanding figure in tech, unknown to many.
I remember really enjoying paying around with rebol back in the day. Sadly I think it was open open sourced after development ceased. The bug tracker that was set up looks abandoned with nobody assigning tickets.
I think most people who were interested in Rebol have moved over to Red.
It's very similar to Rebol and is under active development. If you like Rebol and haven't tried Red, it's worth taking a look: