From: Available software

- FreeBSD is available via ftp from
  <URL:ftp://ftp.freebsd.org/pub/>,
  <URL:ftp://ftp.cosy.sbg.ac.at/pub/mirror/>, and
  <URL:ftp://pdq.coe.montana.edu/pub/mirrors/unix/>.  The latest
  version is derived from 4.4BSD Lite, and contains many extensions.
  See <URL:http://www.freebsd.org> for further information.

- NetBSD is available via ftp from
  <URL:ftp://ftp.netbsd.org/pub/NetBSD>, and is also derived from
  4.4BSD Lite.  See <URL:http://www.netbsd.org> for more information.

- Linux is available via anonymous ftp from
  <URL:ftp://tsx-11.mit.edu/pub/>, <URL:ftp://ftp.funet.fi/pub/OS/Linux>,
  and <URL:ftp://sunsite.unc.edu/pub/Linux>.  It is a freely-distributable
  System V compatible Unix, and is covered by the GNU General Public
  License.  Linux runs almost all PCs with i386 or better CPUs and at
  least 4 megabytes of memory.  See <URL:http://www.linux.org> for further
  details.

- 386BSD is available via ftp from
  <URL:ftp://agate.berkeley.edu/pub/> or
  <URL:ftp://ftp.uu.net:systems/unix/>.  It lies mid-way between
  4.3BSD Reno and 4.4BSD internally, and contains no AT&T-copyrighted
  code.  386BSD runs on ISA bus PCs with i386 or better CPUs.  Use of
  386BSD is not recommended, since it is unstable and has long since
  been superseded by FreeBSD and NetBSD.

- The Hurd is the GNU operating system, being written by Michael
  Bushnell.  It is based on Mach 3.0, and should be available on most
  systems to which Mach has been ported.  A preliminary runnable image
  may be fetched from
  <URL:ftp://alpha.gnu.ai.mit.edu/gnu/>.  Trent
  A. Fisher <trent@gnurd.uu.pdx.edu> runs an unofficial Hurd page
  at <URL:http://www.cs.pdx.edu/~trent/gnu/hurd.html>.

- Lites is a free 4.4BSD-based Unix server which runs on top of Mach.
  Lites provides binary compatibility with 4.4 BSD. NetBSD (0.8, 0.9,
  and 1.0), FreeBSD (1.1.5 and 2.0), 386BSD, UX (4.3BSD) and Linux on
  the i386 platform.  It has also been ported to the pc532, and
  PA-RISC. Preliminary ports to the R3000 and Alpha processors have
  also been made.  For more information, see the Lites home page at
  <URL:http://www.cs.hut.fi/lites.html>, and see also
  <URL:http://www.cs.utah.edu/projects/flux/lites/html>.