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MirOS is an operating system based on OpenBSD and synchronised with the ongoing development of its parent. The most important differences between OpenBSD and MirOS include a completely rewritten bootloader and boot manager, a slim base system without NIS, Kerberos, BIND and i18n, binary security updates for stable releases, and current versions of the GNU developer toolchain.
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NetBSD is a free, secure, and highly portable UNIX-like Open Source operating system available for many platforms, from 64-bit AlphaServers and desktop systems to handheld and embedded devices. Its clean design and advanced features make it excellent in both production and research environments, and it is user-supported with complete source. Many applications are easily available through The NetBSD Packages Collection.
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The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX. OpenBSD is freely available from our FTP sites, and also available in an inexpensive 3-CD set.
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Solaris is a computer operating system, the proprietary Unix variant developed by Sun Microsystems. Early versions, based on BSD UNIX, were called SunOS. The shift to a System V code base in SunOS 5 was marked by changing the name to Solaris 2. Earlier versions were retroactively named Solaris 1.x. After version 2.6, Sun dropped the "2." from the name. Solaris consists of the SunOS UNIX base operating system plus a graphical user environment. Solaris is written in a platform-independent manner and is available for SPARC and x86 processors (including x86_64). Starting from version 10, the Solaris licence changed and the product was distributed free of charge for any system or purpose, but after the acquisition of Sun Microsystems by Oracle in 2009, the product is once again proprietary with a restrictive licence.
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