Hey Grazie, I do work with the VASST guys, I contract doing various tasks, but that doesn't preclude me from wanting to make sure people know about the contest. That was one of my favorite things about VASST when I first started using Vegas, and I'm glad to see it had returned :).
If you're talking about the free desktop here, or if you're talking about the opening part of the training demo video, it was done in blender for modeling, octane for rendering, AE for comping, and Vegas for pre-viz as well as audio sequencing, and the final edit and render. I have to admit though, I think I ended up spending about 20hrs in it by the time I had all my fiddling and such to come out with what I wanted plus little bits of revisions here and there.
I don't see any training demo video on vasst.com. Or are you talking about the vimeo video linked to on the facebook page? That a nice effect that was done.