Operating system
software that manages computer hardware resources
Classic Mac OS
Lisa OS
PlayStation Portable system software
ALT Linux
Single User Control Program
Microsoft Windows
PC-MOS/386
Transaction Processing Facility
Kylin
Version 8 Unix
Unix-like operating system
Portable Operating System Interface
TOPS-20
SECCOS
General Comprehensive Operating System
PlayStation 4 system software
Windows Server 2012 R2
86-DOS
Android Cupcake
Wii U system software
OS/400
Atari TOS
Nokia X
MS/8
Windows Server 2003 R2
TSS/360
Siris 8
SPIN
Android Eclair
Windows Longhorn
Windows Home Server 2011
TOPS-10
Yandex.Kit
OS/360
iOS 8
FLEX
HyperSpace
S-OS
OS X Yosemite
Vino
iMAX 432
Multi-tasking MS-DOS 4.0
HeliOS
OS/390
Android TV
Android Lollipop
Android Auto
MEDINA
cross-platform
Minerva