I don't think there ever was a free and time-unlimited version of Alibre, but there certainly isn't one now that it's changed ownership and become Geomagic Design. There is a time-limited demo version of their inexpensive Cubify product, though, which you can download here: Cubify - Express Yourself in 3D That gives you 14 days to figure out which of your computers it works best on, and go through some tutorials (available on YouTube) to see if you can get the hang of it. I've got more information about it on my site.