Free UNIXes

hi,
I wonder whether there are any free not linux and not *BSD UNIXes for intel? I know there is for exapmle sun solaris, but only the sparc version is free.
Do you know any?

Thanks for help.

Depends on how you define "free", but you can probably look at Minix, Plan 9 etc.

free means not paid, and it won't be bad if it'll be open source but I don't mind if it isn't.

I just wanted to learn sth about pure UNIX, how it's written (if open source) and to write under it.
MINIX's a bit old but I think it's enough for me for now (C hasn't changed since 1996, has it).

thx for answer

ps.
Are linuxes and *BSD systems very not UNIX-like (I've got a book that says bsd 4.2 wasn't full compatible)?

ps2.
Which BSD system do you find the best (most UNIX-like and best documented)?

>> Are linuxes and *BSD systems very not UNIX-like (I've got a book that says bsd 4.2 wasn't full compatible)?
Check out the chart here http://www.levenez.com/unix/ to see how the various Unices evolved. NetBSD evolved from 4.3 BSD Lite sources. Linux was originally written to be a better Minix and IIRC, Linus used the Solaris API as a model for all the API calls in Linux (at least in the early stages). The general consensus on the net is that *BSD has more of a link to the original UNIX(tm) than Linux does.

>>Which BSD system do you find the best (most UNIX-like and best documented)?
Good question. We're entering the realms of holy wars here. I personally have one FreeBSD, one OpenBSD and one NetBSD box at home and I like all three of them. We generally use FreeBSD at work, in production (though I run one OpenBSD box at work as well). HTH