NeXTSTEP

NeXTSTEP is a discontinued object oriented, multitasking operating system developed by NeXT, the computer company founded by Steve Jobs, built on the Mach kernel and the UNIX derived BSD and introduced in 1989 for computers made by NeXT before being ported to other architectures. After NeXT moved away from making hardware, its fourth version was released as OPENSTEP for Mach, named for the OpenStep application programming interface NeXT had developed. Although it sold in relatively small numbers, NeXTSTEP proved historically significant: Tim Berners-Lee built the first web browser and web server on a NeXTSTEP workstation, id Software used it to develop Doom and Quake, and after Apple acquired NeXT in 1996 its technology became the foundation of Mac OS X and, through Darwin, of macOS, iOS, iPadOS, watchOS, and tvOS today. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/