z/OS
Operating system
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z/OS is a 64-bit operating system for IBM z/Architecture mainframes, introduced by IBM in October 2000. It derives from and is the successor to OS/390, which in turn was preceded by a string of MVS versions. Like OS/390, z/OS combines a number of... Wikipedia
Programming languages: C, C++, IBM High Level Assembler, and more
Initial release: March 30, 2001; 23 years ago (V1R1, announced October, 2000)
Platforms: z/Architecture
Available in: English and other languages
Default user interface: ISPF, z/OS Management Facility
Developer: IBM
Latest release: Version 3.1 (V3R1) / September 29, 2023; 6 months ago