Operating system
software that manages computer hardware resources
Livermore Time Sharing System
MIMIC Simulator
MOS
MTS system architecture
vw.os
Michigan Terminal System
Micro T-Kernel
NetWare
Multi-Environment Real-Time
Mac OS X Tiger
Multiple Console Time Sharing System
Nemesis
Not Another Completely Heuristic Operating System
OASIS operating system
OS/8
OS/VS1
OS/VS2
OS 2200
Object-oriented operating system
Olivetti X/OS
Operating System Projects
Panos
Windows Fundamentals for Legacy PCs
monolithic kernel
Pocket PC 2002
REX OS
Banyan VINES
Kid operating system
Windows 3.x
SHARE Operating System
SOX Unix
Scout
Mac OS X Panther
Atari DOS
Nokia Asha
Stratus VOS
supercomputer operating system
System 1
THEOS
TSS-8
The Linux Schools Project
Tin Hat Linux
Transaction Management eXecutive
TurnKey Linux Virtual Appliance Library
Universal Time-Sharing System
University of Michigan Executive System
VS/9
Version 9 Unix
Verve
WAITS