Recently, Anime Studio 6 was released, and so the company has decided to make the full version of 5 available for free for a limited time.

I haven't had a chance to try the program out, myself, but I figured some of you guys might appreciate the info:

[link]

Completely free, completely legit. It will ask for contact info, but no billing info or anything like that. Also, has versions for both PC and Mac.