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Mac OS X succeeded classic Mac OS, the primary Macintosh operating system from 1984 to 2001. Its underlying architecture came from NeXT's NeXTSTEP, as a result of Apple's acquisition of NeXT, which also brought Steve Jobs back to Apple. The first desktop version, Mac OS X 10.0, was released on March 24, 2001.
Precursors to Mac OS X include OPENSTEP, Apple's Rhapsody project, and the Mac OS X Public Beta. macOS is based on Apple's open source Darwin operating system, which is based on the XNU kernel and BSD. [14] macOS is the basis for some of Apple's other operating systems, including iPhone OS/iOS, iPadOS, watchOS, tvOS, and visionOS.
XNU ("X is Not Unix") is the computer operating system (OS) kernel developed at Apple Inc. since December 1996 for use in the Mac OS X (now macOS) operating system and released as free and open-source software as part of the Darwin OS, which, in addition to being the basis for macOS, is also the basis for Apple TV Software, iOS, iPadOS, watchOS, visionOS, and tvOS.
Rhapsody built on NeXTSTEP, porting the core system to the PowerPC architecture and adding a redesigned user interface based on the Platinum user interface from Mac OS 8. An emulation layer called Blue Box allowed Mac OS applications to run within an actual instance of the Mac OS and an integrated Java platform. [1]
The history of macOS, Apple's current Mac operating system formerly named Mac OS X until 2011 and then OS X until 2016, began with the company's project to replace its "classic" Mac OS. That system, up to and including its final release Mac OS 9 , was a direct descendant of the operating system Apple had used in its Mac computers since their ...
The various open source BSD projects generally develop the kernel and userland programs and libraries together, the source code being managed using a single central source repository. In the past, BSD was also used as a basis for several proprietary versions of UNIX, such as Sun 's SunOS , Sequent 's Dynix , NeXT 's NeXTSTEP , DEC 's Ultrix and ...
FreeBSD, an open source general purpose operating system. NeXT NEXTSTEP and OPENSTEP, based on the Mach kernel and 4BSD; the ancestor of Mac OS X (macOS) Apple Inc.'s Darwin, the core of macOS and iOS; built on the XNU kernel (part Mach, part FreeBSD, part Apple-derived code) and a userland much of which comes from FreeBSD [citation needed]
Junos 7.3 and higher is based on FreeBSD 4.10; Junos 8.5 is based on FreeBSD 6.1; Junos 15.1 is based on FreeBSD 10 [19] Junos 18.1 is based on FreeBSD 11 [20] KACE Networks's KBOX 1000 & 2000 Series Appliances and the Virtual KBOX Appliance [citation needed] Lynx Software Technologies LynxOS, uses FreeBSD's networking stack [21] [22] McAfee ...