早期操作系統(專利保護)
TRS-DOS,ROM OS's
TI99-4
Commodore PET,64,和 VIC-20,
第壹套IBM-PC
蘋果電腦
Sinclair Micro和QnX等
非Unix商業操作系統
CPM操作系統
MP/M-80
UCSD P-system
Mini-FLEX
SSB-DOS
CP/M-86
DR-DOS
FreeDOS
MS-DOS
PC-DOS
Mach 由卡納尼基梅隆大學研究
L4微內核 第二代微內核
CHORUS
Choices
Multics
OS-9
NSJ
Netware:壹種網絡服務器操作系統
Unix及類似系統
A/UX(Apple UNIX)
Unix
微軟Xenix
ChorusOS
Cromix
UNIflex
OS-9
IBM的AIX
BSD
FreeBSD
NetBSD
OpenBSD
DragonFly BSD
PC-BSD
Digital UNIX,即之後康柏Tru64
DNIX
HP的HP-UX
GNU/Hurd
SGI的IRIX
Inferno
Linux(或稱GNU/Linux)
Mac OS X
MenuetOS
Minix
OSF/1
Plan9
SCO的SCO UNIX
Sun的SunOS,即之後的Solaris
System V
Ultrix
UniCOS
麒麟操作系統(Kylin),由國防科技大學、中軟公司、聯想公司、浪潮公司和民族恒星公司五家單位合作研制的服務器操作系統
OS/390
z/OS
Syllable
其他
Acorn
Arthur
ARX
RISC OS
RISCiX
Amiga
AmigaOS
Atari ST
TOS
MultiTOS
MiNT
蘋果電腦(Apple/Macintosh)
Apple DOS
ProDOS
Mac OS
Mac OS X
Mac OS X 10.4 Tiger
Mac OS X 10.5 Leopard
Mac OS X 10.6 Snow Leopard (Alpha)
pink OS
BeOS
A/UX
Be
BeOS
BeIA
Digital/康柏(Compaq)
AIS
OS-8
RSTS/E
RSX-11
RT-11
TOPS-10
TOPS-20
VMS(後更名為OpenVMS)
IBM
OS/2
AIX
OS/400
OS/390
VM/CMS
DOS/VSE
VSE/SP
VSE/ESA
OS/360
MFT
MVT
SVS
MVS
TPF
ALCS
z/OS
PC-DOS
pink OS
微軟(Microsoft)
MS-DOS
Xenix
Microsoft Bob
基於MS-DOS操作系統的Windows
Windows 1.0
Windows 2.0
Windows 3.1
Windows 95
Windows 98
Windows ME
Windows NT
Windows NT 3.5
Windows NT 4
Windows 2000
Windows XP
Windows XP SP1
Windows XP SP2
Windows XP SP3
Windows XP Media Center Edition
Windows XP Home Edition
Windows XP Tablet PC Edition
Windows XP Professional
Windows XP Professional x64 Edition
Windows Server 2003
Windows Server 2003 64-bit Edition
Windows Vista
Windows Vista SP1
Windows Vista Home Basic
Windows Vista Home Premium
Windows Vista Business
Windows Vista Ultimate
Windows Vista Enterprise
Windows Vista Starter
Windows Server 2008
Windows Server "Longhorn" Web x86
Windows Server "Longhorn" Web x64
Windows Server "Longhorn" Standard x86
Windows Server "Longhorn" Standard x64
Windows Server "Longhorn" Enterprise x86
Windows Server "Longhorn" Enterprise x64
Windows Server "Longhorn" Datacenter x86
Windows Server "Longhorn" Datacenter x64
Windows 7
Windows Server 2008
Novell
NetWare
Unixware
SUSE Linux
NeXT
NEXTSTEP(即之後的Mac OS X)
Plan 9
Inferno
Prime Computer
Primos
西門子
BS2000 - 用於西門子公司的大型主機。
SINIX(也稱Reliant UNIX) - 用於西門子公司的UNIX電腦系統。