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List of operating systems

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1 Early Proprietary Microcomputer OS

Apple Computer
Commodore PET, Commodore 64, and Commodore VIC-20,
The very first IBM-PC (3 OS offered to start, USCD Psystem, CPM-86, PC-DOS)
Sinclair Micro and QX, etc
TRS-DOS[?], ROM OS[?]'s (largely Microsoft BASIC implementations with file system extensions)
TI99-4[?]
Flex[?] (by Technical Systems Consultants for Motorola 6800 based microcomputers: SWTPC, Tano[?], Smoke Signal Broadcasting[?], Gimix[?], etc)
mini-FLEX[?] (by TSC[?] for 5.25" disks on 6800 based machines)

Unix-like and other POSIX compliant systems

AIX (Unix from IBM)
AtheOS (continued under the Syllable code-fork)
BSD (Berkeley Software Distribution, a variant of Unix for DEC VAX hardware)
Cromix[?] (Unix emulating OS from Cromemco)
Coherent (Unix-emulating OS from Mark Williams Co. for PC class computers)
DNIX
Digital UNIX (which became Compaq's Tru64)
FreeBSD (one of the open source outgrowths of UC Berkeley's abandonement of BSD Unix)
GNU/Hurd
GNU/Linux (commonly called Linux the name of the kernel)
HP-UX from HP
IRIX from SGI
MacOS X from Apple Computer
Menuet
NetBSD
OS-9
OS-9/68k[?]
OS-9000[?]
OS/390
OSF/1
OpenBSD
QNX
RiscOS
SCO UNIX (from SCO, bought by Caldera and re-renamed SCO)
Solaris from Sun Microsystems
SunOS from Sun Microsystems (which became Solaris)
System V (a release of AT&T Unix, 'SVr4' was the 4th minor release)
UNIX (OS developed at Bell Labs ca 1970 initially by Ken Thompson)
UNIflex[?] (Unix emulating OS by TSC[?] for DMA capable Mototola 6809 based computers)
Ultrix (DEC's first version of Unix, based on BSD)
UniCOS
Xenix (Microsoft's licensed version of Unix for various hardware platforms)
z/OS (latest version of IBM mainframe OS)

AROS (Amiga Research Operating System)
Control Program/Monitor-80[?] (CPM operating system)
MP/M-80[?]
UCSD P-system[?]
FLEX9[?] (by TSC[?] for Motorola 6809 based machines; successor to FLEX)
SSB-DOS[?] (by TSC[?] for Smoke Signal Broadcasting; a variant of FLEX in most respects)
CP/M-86
DR-DOS (from Digital Research, later Novell and then Caldera)
FreeDOS
MS-DOS
PC-DOS (IBM's version of DOS for PC machines)
Mach (from OS kernel research at CMU)
Microsoft Windows
Multics (joint OS development project by Bell Labs, GE, MIT)
NewOS
Native Oberon (developed at ETH-Zurich by Niklaus Wirth et al)
OS-9 (Unix emulating OS from Microware for Motorola 6809 based microcomputers)
OS-9/68k[?] (Unix emulating OS from Microware for Morotola 680x0 based computers; developed from OS-9)
SkyOS[?]
TripOS
TUNES
QDOS (developed at Seattle Computer Products by Tim Paterson for the new Intel 808x CPUs, licensed to Microsoft and became MS-DOS/PC-DOS)
VME by International Computers Limited[?] (ICL)
MorphOS[?] by Genesi[?]
NetWare[?] by Novell
NeXTStep (which became Mac OS X by NeXT
Plan 9, Inferno (originally from Bell Labs Computer Research)
Primos[?] by Prime Computer[?]
BS2000 by Siemens AG

IBM