Today morning I was told "check out the 'the last lecture' by Randy, its inspiring" and I asked "do you mean Randy Pausch? hey ..................". So I dug out the mail he wrote to me some years ago :

Yes, the Alice system is completely free, and you can download it from www.alice.org . The version using the characters from "the Sims" will also be completely free, as a public service from Carnegie Mellon University.

Rest In Peace Randy !!