Operating system
software that manages computer hardware resources
Versatile Real-Time Executive
FUSS
Soft Hard Real-Time Kernel
House
Coherent
Ubuntu
Mac OS X Snow Leopard
Multiuser DOS
Linux
Ubuntu for Android
Windows 97
Junos
Jessy
NORD
OZONE
Pilot
Russian Fedora Remix
Spring
xv6
DEMOS
Windows Mobile 6.0
Incognito
System 7
System 6
OS ES
Linux Unified Kernel
OS2000
Dartmouth Time Sharing System
Macintosh operating systems
RAMON
GNU
ROM-DOS
4K Disk Monitor System
A/ROSE
Acorn MOS
Advanced Comprehensive Operating System
Arthur operating system
MS-DOS
Mac OS X Lion
Mac OS X 10.1
Aurora SPARC Linux
Windows 98
BOS/360
Windows 2000
Windows Me
Windows 2.0
Windows Embedded Compact
Commercial Operating System
Windows 3.0
Black Lab Linux