Operating system
software that manages computer hardware resources
Windows 3.1
Business Operating System
Android Pie
Windows 8
Catamount
Windows Server 2019
Chippewa Operating System
Cisco Security Monitoring, Analysis, and Response System
Cray Time Sharing System
Denali
Edos
EOS
ERIKA Enterprise
Edinburgh Multiple Access System
Windows 10X
Fabric OS
iOS 12
GNOSIS
Galileo
GeckOS
Group Control System
ABC GNU/Linux
Mac OS X 10.2
Atlas Supervisor
Wheels
GEOS (8-bit)
/e/OS
Mac OS X Server 1.0
GEORGE
hobbyist operating system
distributed operating system
Operating System Embedded
Hydra
INK
ISIS
disk operating system
disk operating system
Inquisitor
OSx86
Singularity
Star Trek project
Windows 9x
Android 10
Apple DOS
UNIX System V
OS X Mountain Lion
LOCUS
LOUD
Android Automotive
Interactive Unix