FreeBSDFree and open-source Unix-like operating systemOperating systemFreeBSD is a free and open-sourceUnix-likeoperating system descended from the Berkeley Software Distribution (BSD). The first version was released in 1993 developed from 386BSD, one of the first fully functional and free Unix clones on affordable home-class hardware, and has since continuously been the most commonly used BSD-derived operating system.
NetBSDFree and open-source Unix-like operating systemOperating systemNetBSD is a free and open-sourceUnix-likeoperating system based on the Berkeley Software Distribution (BSD). It was the first open-source BSD descendant officially released after 386BSD was forked. It continues to be actively developed and is available for many platforms, including servers, desktops, handheld devices, and embedded systems.
OpenBSDOpenBSD is a security-focused, free software, Unix-likeoperating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by forkingNetBSD 1.0. The OpenBSD project emphasizes portability, standardization, correctness, proactive security, and integrated cryptography. The OpenBSD project maintains portable versions of many subsystems as packages for other operating systems.
MacOSmacOS (previously OS X and originally Mac OS X) is a proprietary Unix operating system, derived from OPENSTEP for Mach and FreeBSD, which has been marketed and developed by Apple since 2001. It is the current operating system for Apple's line of Mac computers. As of April 2026, within the market of desktop and laptop computers, it is the second most widely used desktop OS, after Microsoft Windows and ahead of all Linux distributions, including ChromeOS and SteamOS.
Operating systemAn operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and other resources.
SunOSSunOS is a Unix-branded operating system developed by Sun Microsystems for their workstation and servercomputer systems from 1982 until the mid-1990s. The SunOS name is usually only used to refer to versions 1.0 to 4.1.4, which were based on BSD, while versions 5.0 and later are based on UNIX System V Release 4 and are marketed under the brand nameSolaris. HistorySunOS 1 only supported the Sun-2 series systems, including Sun-1 systems upgraded with Sun-2 (68010) CPU boards.
Computer Systems Research GroupThe Computer Systems Research Group (CSRG) was a research organization at the University of California, Berkeley, dedicated to enhancing the AT&T Unix. Funded primarily by the DARPA. The CSRG focused on developing portable, high-performance Unix variants for academic and research environments, producing the Berkeley Software Distribution series.
University of California, BerkeleyThe University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public land-grant research university in Berkeley, California, United States. Founded in 1868 and named after the Anglo-Irish philosopher and clergyman George Berkeley, it is the state's first land-grant university and the founding campus of the University of California system. Berkeley has an enrollment of more than 45,000 students.
UnixUnix ( , YOO-niks; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, the development of which started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
Source CodeSource Code is a 2011 science fictionaction thriller film directed by Duncan Jones and written by Ben Ripley. It stars Jake Gyllenhaal as a US Army officer who is sent into an eight-minute virtual re-creation of a real-life train explosion, and tasked with determining the identity of the terrorist who bombed it. Michelle Monaghan, Vera Farmiga, and Jeffrey Wright play supporting roles.
Bell LabsResearch and scientific development companyNokia Bell Labs, commonly referred to as Bell Labs, is an American industrial research and development company owned by the Finnish technology company Nokia. With headquarters located in Murray Hill, New Jersey, the company operates several laboratories in the United States and around the world.
AT&TAT&T Inc., an abbreviation of its predecessor's original name, the American Telephone and Telegraph Company, is an American multinationaltelecommunications company headquartered at the Whitacre Tower in Downtown Dallas, Texas. AT&T is the world's third-largest telecommunications company by revenue, the third-largest wireless carrier in the United States behind T-Mobile and Verizon, and the nation's largest fiber internet provider.
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