Free Unix

Where to find the Unix you know you need

        Download sites for (mostly) free Unixes.

Ancient Unix

        SCO has released source code and some binary images for Ancient Unixes (5th-7th editions, etc.). The binary images are particularly useful in conjunction with the PDP11 simulator available from our emulators page


        Apple users have many choices: Darwin, Linux for 680x0-based and PowerPC-based Macintosh computers, and NetBSD for 680x0-based and PowerPC-based Macintosh computers.


        FreeBSD, OpenBSD and NetBSD. We will step out on a limb here and suggest any of these to the newcomer to Unix on the personal computer. Each of these BSD-based distributions is mature, secure and reliable.


        You already know all about it, here's where to get it if you want it: Linux.


        As a "free Unix clone that is available with all the source code", it predates (and has a rather strange and twisted history with) Linux. Unlike Linux, it's possible for a person to study and understand the entire system within a reasonable timeframe. Yes, we're talkin' 'bout Minix.

Plan 9

        While not, strictly speaking, a Unix variant, Plan 9 generates a lot of interest in the Unix community. Plan 9 is what UnixPorting would be running if all Unix-based operating systems were to suddenly disappear.


        Solaris 10 is available from Sun, for both the Intel and SPARC platforms.