List of Operating Systems.

AdaOS	DTOS	LegOS	PaulOS	Syllable
ADMIRAL	DVIX	leJOS	P BASIC	Symbian OS
Adrenaline	DYNIX Unix (Sequent)	Linux	PC-BSD	SymbOS
aerolitheOS	ECL-3211	Lisa OS	PC-DOS	Symobi
Aimos	eComStation	LTSS	PC/M-System	Symphony OS
AIOS	eCos	LynxOS	PDOS	Synapse
AIX	EduOS	Möbius	PEACE	System 6 (Mac OS)
AIX/370	EGOS	Mach	Pebble	System 7 (Mac OS)
AIX/ESA	ekkoBSD	Mac OS 8	Pegasos	System V Release
Allegro	Elate	Mac OS 9	PETROS	TABOS
AllianceOS	ELKS	Mac OS X	Phantom OS	Tabos
Alto OS	Elysium	MANOS	Phos	TalOS
Amiga OS	EOS	MaRTE OS	PIOS	TAOS
Amoeba	EP/IX	Maruti	PizziOS	TENEX
Amstrad	EPOC	Masix	Plan 9	THE
AMX RTOS	ERaMS	Maverick OS	Plex86	Thix
AngelOS	ERIKA	MBOS	PM_SZ_OS	ThreadX
Antarctica	EROS	MCP (Master Control Program)	PocketPC 2003	ThrillOS
AOS/VS	ESER	MDOS	PowerMAX	TI-99 4A
Aperios	ESIX	MenuetOS	PowerOS	TinyOS
Apollo Domain/OS	ESKO	Merlin	PowerSX	TIS APL
ApolloOS	Eumel	Micriµm	PowerUX	TNIX
Apostle	EuNIX	MICRODOS	ProDOS	TOPS-10
Archimedes OS	Exopc	MicroVMS	Prologue	TOPS-20
AROS	ExOS	MikeOS	Proolix	TriangleOS
ARTOS	Express	Minima	ProOSEK	Tripos
Asbestos	Famos	Minix	PSOS	TRON
Athena	FDOS	Minux	pSOSystem	TRS-DOS
AtheOS	Fiasco	Miranda	PSU	Tru64 UNIX
AtomsNet	Flamethrower	Miray µnOS	PTS DOS	TSX-32
Atomthreads	FlashOS	MITE 80/IOS	PublicOS	TUD:OS
AuroraOS	FlexOS	MK++	PURE	TUNES
B-Free	FLP-80 DOS	ML	QDOS	TurboDOS
Bada	Flux	ModulOS	QNX	UberOS
BAL	Flux-Fluke-Flask	Monitor	Quadros	UCSD-p
Banyan VINES	FMS	MOPS	RadiOS	UDOS
Basic Executive System	Forth	MorphOS	RBASIC	Ultrix
BeIA	FreeBSD	MOS	RCOSjava	UMDS
BeOS	FreeDOS	MOSIX	RDOS	UMN
Beowulf	FreeDOWS	MPE/iX	ReactOS	UNI/OS
BKY	FreeVMS	MPE OS	REAL-32	Unicos
BlueEyedOS	Frenzy	MRT1700	Realogy Real Time Architekt	UNICOS/lc
BOS	FullPliant	MS-DOS	REBOL-IOS	Uni FLEX
BOS1810	FunatixOS	MSOS	RMOS	Unisys U5000
BoxOS	FxOS	MT809	RMS 68k	Unix System
BPMK	GazOS	Multics	Roadrunner	UnixWare
bpmk	GCOS	Mungi	Rome	Unununium
BRiX	GECOS	MUTOS	ROME	USIX
BS600	GeekOS	muVinix	RSTS/E	UTS
BS2000	Gemini Nucleus	MVS	RSX-11	UXP/V
BSDi	Genera	NachOS	RT-11	V2 OS
BugOS	GEORGE	NCR Unix	RTEL	Vapour
Calmira	GEOS	NEC DOS	RTEMS	VERSAdos
CCP (Computer Control Program)	GM OS	NECUX	RT Mach NTT	Visopsys
CDOS	GNU Hurd	Nemesis	rtmk	Visual Network OS
Cefarix	GNUstep	NeOS	RTMX	VM/ESA
C Executive	Go	NetBSD	RTOS-32	VM/VSE
Chaos	Goah	Netware	RTOS-UH	VME
Chimera	Gould OS	NewDeal	RTS-80	VMS
Chippewa OS	Grasshopper	NEWDOS	RTX	VRTX/8002
Choices	GUIDE	NewOS	RTXDOS	VRTX/OS
Chorus	Haïku	Nexus	RxDOS	VSE
Cinder OS	HA-MSP	Nimbus	S.Ha.R.K	VSOS
Cisco IOS	Hactar	Node OS	Sanos	VSTa
Clicker32	Harmony	NOS	SCO OpenServer	VTOS
CMW+ (SCO)	Helios	NOS/BE	SCOPE	VxWorks
COBRA	HES	NOS/VE	ScorchOS	WEGA
Coherent	Hive	Nova	ScottsNewOS	WildMagnolia
CONSENSYS	HOPE	Novell DOS	Scout	Windows 7
ConvexOS	HP-87 OS	NS/GDOS	SCP	Windows 8
Cos	HP-UX	NSK	SCP (System Control Program)	Windows 95
Cosy	HT-11	NTDIOS	SCP-IBE	Windows 98
Counterpoise	Hurd	Nucleus	Self-R	Windows 98 SE
CP/K	Hurricane	Oaesis	SeOS	Windows 2000
CP/M	HydrixOS	Oasis	Sequent	Windows Automotive
CP/NET	i5/OS	Oberon	SEVMS VAX	Windows CE
CP/Z	IBM PC-DOS	Objex	Shark	Windows ME
CPF (Control Program Facility)	IBSYS	Odin	SharpOS	Windows NT
Cromix	Icaros Desktop	Omega 4	ShawnOS	Windows Server 2003
Cronus	Iridium OS	OnCore	SIBO	Windows Server 2003 R2
CSOC	IRIX	On Time RTOS-32	Sinclair	Windows Server 2008
CTOS	iRMX	Opal	Sinix	Windows Server 2008 R2
CTSS	IRTS	OpenBeOS	SINTRAN III	Windows Vista
CX/SX	ISC (Interactive)	OpenBSD	SkyOS	Windows XP
Cyber (CDC)	ISIS	OpenDarwin	Slikware	WinMac
Cygnus	ISSL	OpenRavenscar	sMultiTA	WIZRD
DAC	ITRON	OpenServer	SOBS	x-kernel
Darwin	ITS	OpenVision	Solaris	XAOS
Data General	JAMB	OpenVMS	Solar_OS	Xenix
DC/OSx	JavaOS	OppcOS	Solbourne UNIX	Xinu
DCP	Jbed	OS-2	SOS	xMach
Degenerate OS	JeniOS	OS-9	SP6800	XOS
Delitalk	Jeo-OS	OS-C	Spice	XTS
Deming OS	Jibbed	OS/2	Spice/MT	Yamit
DEMOS	JOS	OS/2 Warp	SPIN	Yaxic
DesktopBSD	JTMOS	OS/9	Spinix	Yoctix
DESKWORK	JUNOS	OS/360	SPOX	z-VM
DG/UX	JxOS	OS/390	Spring	z/OS
DIGITAL UNIX	KAOS	OS/400	Squeak	Z9001-OS
dingOS	Katix	OS/ES	SSP (System Support Program)	ZealOS
DK/DOS	Kea	OS/M	STAR-OS	Zeta
DLD	Kerberos	OS4	STARCOS	Zeus Zilog
DNIX	KeyKOS	osCAN	Starplex II OS	zeVenOS
Domain OS	KOS	OSE	Sting	ZMOS
DOS	KRONOS	OSF/1	StreamOS	ZotOS
DOS2	KROS	Osx	Subsump	ZRTS 8000
DOS 50	KRUD	OZONE	SUMO
Dosket	Kylin	PAKOS	SunMOS
dr'ex	L4	Palm OS	SunOS
DR-DOS	L13Plus	PAPL	SunriseOS
Drops	LainOS	Paramecium	SuperDOS
Drywell OS	LAN Manager	ParixOS	SVM
DS-OS	LDOS	Paros	SVR