#
3OS
A
AIX?
Amiga OS
AROS
AtomOS?
B
BeleniX
BeOS
Bluebottle
Blue Eyed OS
C
CP/M
E
EROS?
F
Free DOS
FreeBSD
G
Geek OS?
GNU/Hurd
GNU/Linux
H
Haiku
HP/UX?
HronOS
I
Inferno
K
KolibriOS
J
JOS
JNode
L
LynxOS?
M
Mac OS
MDF
Menuet
Minix
Miraculix
Mockup
MorphOS
MS DOS
N
Native Oberon
NetBSD
New OS
O
BSD/OpenBSD
Open Solaris
OS/2
OSFree
Oberon
P
Petr OS
Plan 9
Plan B
Proolix
PolitOS
Q
QNX
R
ReactOS
RT-11
S
SchilliX
SkyOS
Solaris
StormDOS
StreamOS
Syllable
Synergy
T
Triangle OS?
U
UNIX
Uzh OS
V
Visopsys
Z
Zeta