NeXTSTEP
Operating system
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NeXTSTEP is a discontinued object-oriented, multitasking operating system based on the Mach kernel and the UNIX-derived BSD. It was developed by NeXT Computer, founded by Steve Jobs, in the late 1980s and early 1990s and was initially used for its... Wikipedia
Developer: NeXT and Avie Tevanian
Initial release: September 18, 1989; 34 years ago
License: Proprietary software
Programming languages: C and Objective-C
Default user interface: Graphical
Final preview: 4.2 Pre-release 2 / September 1997
Final release: 3.3 / 1995