Not free, only trial. $25 to $200 a MONTH, depending on usage
It was a few days ago when I looked at it so I'd forgotten about that pricing scheme. It was when I was looking further into what that actually meant that I found an Autodesk forum where they announced that it would always be free for hobbyist use. See the sixth post on this page:
http://autodesk.lithium.com/t5/News-and ... 212/page/2