total no of operating systems exist on earth {part:-1}

Operating systems (573)

2K
86-DOS
A/UX
Acados
ACP (Airline Control Program)
AdaOS
ADMIRAL
Adrenaline
aerolitheOS
Aimos
AIOS
AIX
AIX/370
AIX/ESA
Allegro
AllianceOS
Alto OS
Amiga OS
Amoeba
Amstrad
AMX RTOS
AngelOS
Antarctica
AOS/VS
Aperios
Apollo Domain/OS
ApolloOS
Apostle
AROS
ARTOS
Asbestos
Athena
AtheOS
AtomsNet
AuroraOS
B-Free
BAL
Banyan VINES
Basic Executive System
BeIA
BeOS
Beowulf
BKY
BlueEyedOS
BOS
BOS1810
BoxOS
bpmk
BPMK
BRiX
BS600
BS2000
BSDi
BugOS
Calmira
CCP (Computer Control Program)
CDOS
Cefarix
C Executive
Chaos
Chimera
Chippewa OS
Choices
Chorus
Cinder OS
Cisco IOS
Clicker32
CMW+ (SCO)
COBRA
Coherent
CONSENSYS
ConvexOS
Cos
Cosy
Counterpoise
CP/K
CP/M
CP/NET
CPF (Control Program Facility)
Cromix
Cronus
CTOS
CTSS
CX/SX
Cyber (CDC)
Cygnus
Darwin
Data General
DC/OSx
DCP
Degenerate OS
Delitalk
Deming OS
DEMOS
DesktopBSD
DESKWORK
DG/UX
DIGITAL UNIX
dingOS
DK/DOS
DLD
DNIX
Domain OS
DOS
DOS2
DOS 50
Dosket
dr'ex
DR-DOS
Drops
Drywell OS
DS-OS
DTOS
DVIX
DYNIX Unix (Sequent)