Subrion CMS Products Overview :: Subrion Content Management Script
Check the Download free in the upper left. I clicked the button and it worked for me. See if it worked for you.
They don't ask for email or anything like that if you thought you needed to sign up, this is really a free piece of software. My site mborotalks.com is running the publishing and directory packages, I haven't site up the directory yet as I have been busy with other things but it works very well.