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2. XNU - Wikipedia

   en.wikipedia.org/wiki/XNU

   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.

3. Darwin (operating system) - Wikipedia

   en.wikipedia.org/wiki/Darwin_(operating_system)

   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.

4. macOS version history - Wikipedia

   en.wikipedia.org/wiki/MacOS_version_history

   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 ...

5. Mac operating systems - Wikipedia

   en.wikipedia.org/wiki/Mac_operating_systems

   The system was launched as Mac OS X, renamed OS X from 2012—2016, [10] and then renamed macOS as the current Mac operating system that officially succeeded the classic Mac OS in 2001. 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 ...

6. List of Apple operating systems - Wikipedia

   en.wikipedia.org/.../List_of_Apple_operating_systems

   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.

7. Comparison of open-source operating systems - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_open-source...

   E/OS Yes Yes Yes No: Yes Yes Yes No No No No No No Yes Yes Name ATA SATA SCSI USB 3.0 USB 2.0 USB 1.1 FireWire PCMCIA/PC card AGP Nvidia official driver IA-32 Nvidia official driver IA-64 Nvidia official driver AMD64 ATI official driver x86 ATI official driver x86-64 ATI r200 free software driver ATI r300 free software driver

8. Mac (computer) - Wikipedia

   en.wikipedia.org/wiki/Mac_(computer)

   The last version of classic Mac OS, Mac OS 9, was introduced in 1999. Mac OS 9 was succeeded by Mac OS X in 2001. [196] Over the years, Mac OS X was rebranded first to OS X and later to macOS. [197] macOS is a derivative of NextSTEP and FreeBSD. It uses the XNU kernel, and the core of macOS has been open-sourced as the Darwin operating system.

9. NeXTSTEP - Wikipedia

   en.wikipedia.org/wiki/NeXTSTEP

   Based upon the "OPENSTEP for Mach" operating system, and developing the OpenStep API to become Cocoa, Apple created the basis of Mac OS X, [14] and eventually of iOS, iPadOS, watchOS, and tvOS. GNUstep is a free software implementation of the OpenStep standard. [15]