operating system
software that manages computer hardware resources
Arthur operating system
Early Acorn Computers RISC operating system; later versions known as RISC OS
Apple CP/M
operating system
Mac OS X Tiger
fifth major release of Mac OS X
Mac OS X Panther
fourth major release of macOS
Control Program Facility
operating system of the IBM System/38 minicomputer
Windows Odyssey
Cancelled operating system
Burroughs MCP
mainframe operating system
Lisa OS
operating system by Apple
Minerva
reimplementation of Sinclair QDOS
TR-DOS
disk operating system for the ZX Spectrum
Time Sharing Operating System
mainframe operating system from RCA run their Spectra computers
Super OS
Linux distribution
Cosmos (Olivetti)
operating system developed by Olivetti
Multiuser DOS
family of CP/M- and DOS-compatible multi-user multi-tasking operating systems
OS ES
operating system for the Soviet ES EVM line of mainframe computers
Black Lab Linux
free software Linux distribution
CB UNIX
Unix variant developed by the Columbus, Ohio branch of Bell Labs
Cisco Security Monitoring, Analysis, and Response System
security monitoring tool for network devices
Galileo
operating system
Jazz Linux
Linux distribution
Nemesis
operating system designed by the University of Cambridge
Olivetti X/OS
operating system from the Unix family
Sx-window
GUI for Sharp X68000 computers
University of Michigan Executive System
operating system
Verve
research operating system from Microsoft Research
Z-DOS
operating system
Android Cupcake
version of the Android operating system
Cambridge Distributed Computing System
operating system
SO
operating system
Nintendo Switch system software
operating system
Harmony (operating system)
Research operating system.
SONiC
microsoft open source network operating system
Windows Whistler
operating system based on Microsoft Windows
Windows Server
brand name for a group of server operating systems by Microsoft
Ubuntu for Android
Ubuntu for Android devices
MS-DOS
Microsoft operating system
Versatile Real-Time Executive
real-time operating system
Idris
operating system
Windows Embedded Compact
operating system subfamily by Microsoft
UNIX System V
most-referenced Unix version and starting point for the first versions of POSIX and the Single UNIX Specification
Interactive Unix
operating system
Multics
operating system
PlayStation Vita system software
system software for the PlayStation Vita and PlayStation TV video game consoles
Newton OS
operating system for apple newton PDA
Coyote Linux
Operative system
Transaction Processing Facility
IBM mainframe operating system used for transaction processing
Qt Extended
operating system
Lantastic
personal computer networking system