OpenBSD
OpenBSD (CD) $1.95
OpenBSD operating system has many Unix qualities and came from Berkeley Software Distribution or BSD. Just like with most BSD-based operating systems OpenBSD kernel and userland programs, like shell, cat and ps are all developed in a single source repository.OpenBSD supports binary emulation of most programs from Solaris, FreeBSD, Linux, BSD/OS, SunOS and HP-UX.
