You can clone with
HTTPS or Subversion.
I tried to run the Transdraw demo at http://www.mozart-oz.org/demo/ but this leads me to a broken link.
1) Go to http://www.mozart-oz.org/demo/
2) Click on the transdraw demo link. http://www.info.ucl.ac.be/people/ned/transdraw.html
3) No demo for you. =)
I confirm the link is broken. I've emailed the mailing list about getting it updated or removed.