Operating system
software that manages computer hardware resources
Windows Mobile 2003
Windows Mobile 5.0
Windows Mobile 6.1
Windows Mobile 6.5
Woof
Xerox Operating System
Pop!_OS
Windows Neptune
Linux From Scratch
NeXTSTEP
Windows 95
Miracle Linux
Cray Operating System
Online OS
exotic operating system
Android 11
Poseidon Linux
Android-x86
BlackBerry 10
BlackBerry OS
A2
Pixel Experience
Mac OS 9
Mac OS X 10.0
mobile operating system
EXEC
PlayStation 3 system software
System 2
System 3
System 4
UDOS
Conversational Monitor System
Windows Essential Business Server 2008