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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.
The original operating system for the Macintosh was the classic Mac OS, which was introduced in early 1984 as System Software. In 1997, System Software was renamed Mac OS. In 1999, Mac OS X Server 1.0 was released, followed by Mac OS X 10.0, the first consumer release of the Mac OS X.
It previously existed as an independent open-source operating system, first released by Apple Inc. in 2000. It is composed of code derived from NeXTSTEP, FreeBSD, [3] other BSD operating systems, [6] Mach, and other free software projects' code, as well as code developed by Apple. Darwin's unofficial mascot is Hexley the Platypus.
The system was originally marketed as simply "version 10" of Mac OS, but it has a history that is largely independent of the classic Mac OS. It is a Unix-based operating system [11] [12] built on NeXTSTEP and other NeXT technology from the late 1980s until early 1997, when Apple purchased the company and its CEO Steve Jobs returned to Apple ...
At macOS's core is a POSIX-compliant operating system built on top of the XNU kernel, [79] (which incorporated large parts of FreeBSD kernel [12]) and FreeBSD userland [12] for the standard Unix facilities available from the command line interface. Apple has released this family of software as a free and open source operating system named Darwin.
MUSIC/SP – an operating system developed for the S/370, running normally under VM; OS ES – an operating system for ES EVM; PC-MOS/386 – DOS-like, but multiuser/multitasking; Prolog-Dispatcher – used to control Soviet Buran space shuttle. SINTRAN III – an operating system used with Norsk Data computers. SkyOS – commercial desktop OS ...
Calendar, previously known as iCal before OS X Mountain Lion, is a personal calendar app made by Apple Inc., originally released as a free download for Mac OS X v10.2 on September 10, 2002, before being bundled with the operating system as iCal 1.5 with the release of Mac OS X v10.3. It tracks events and appointments added by the user and ...
A/UX is a Unix-based operating system from Apple Computer for Macintosh computers, integrated with System 7's graphical interface and application compatibility. It is Apple's first official Unix-based operating system, launched in 1988 and discontinued in 1995 with version 3.1.1. [2]