List of Operating systems

The first operating systems

CTSS (The Compatible TimeShare System, developed at MIT by Corbato, et al.)
Incompatible Timesharing System (The Incompatible Timeshare System, developed at MIT for the DEC 10 / 20 mainframes)
Multics (joint OS development project by Bell Labs, GE, and MIT)
Master programme developed for Leo Computers, Leo III in 1962
THE operating system (by Dijkstra et all


The first proprietary microcomputer operating systems


Apple Computer (initial version was firmware with Integer BASIC; later versions included a Microsoft BASIC)
Business Operating System (BOS) - cross platform, command-line based
Commodore PET, Commodore 64, and Commodore VIC-20,
The very first IBM-PC (3 OS offered to start, UCSD P-system, CPM-86, PC-DOS)
Flex (by Technical Systems Consultants for Motorola 6800 based microcomputers: SWTPC, Tano, Smoke Signal Broadcasting, Gimix, etc)
FLEX9 (by TSC for Motorola 6809 based micros)
mini-FLEX (by TSC for 5.25" disks on 6800 based machines)
Sinclair Micro and QX, etc
TRS-DOS, ROM OS's (largely Microsoft BASIC implementations with file system extensions)
TI99-4


Unix-like and other POSIX-compliant systems


AIX (Unix from IBM)
Amoeba (research OS by Andrew S. Tanenbaum)
AtheOS (continued under the Syllable code-fork)
A/UX (Unix-based Apple OS from the beginning of the 1990s)
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 HP's Tru64 for Digital's AXP line of 64-bit computers)
FreeBSD (one of the open source outgrowths of UC Regents' abandonment of CSRG's 'BSD Unix')
GNU/Hurd
GNU/Linux (see Linux)
HP-UX from HP
Idris workalike from Whitesmiths
IRIX from SGI
LainOS (FreeBSD-based project that aims to reproduce the "Navi" GUI from Serial Experiments Lain)
Linux (major free Unix-like kernel)
Mac OS X from Apple Computer
Minix (study OS developed by Andrew S. Tanenbaum in the Netherlands)
NetBSD (one of the post-CSRG open source varieties of BSD)
NeXTSTEP for Stephen Job's NeXT workstations.
OS-9(for Morotola 6809 based machines)
OS-9/68k (for Motorola 680x0 based machines)
OS-9000 (OS-9 written in C for intel and other processors)
OS/360
OSF/1
OpenBSD (one of the post-CSRG open source varieties of BSD)
OPENSTEP NeXTSTEP ported to Intel x86, HP PA-RISC, and other platforms.
Plan 9 (networking OS developed at Bell Labs)
QNX (POSIX, microkernel OS; usually a real time embedded OS)
Rhapsody
RiscOS
SCO UNIX (from SCO, bought by Caldera who re-renamed themselves SCO)
Solaris from Sun Microsystems
SunOS from Sun Microsystems (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, extended addresses, Mototola 6809 based computers; e.g. SWTPC, GIMIX, ...)
Ultrix (DEC's first version of Unix for VAX, PDP-11, and MIPS-based Decstation computers, based on BSD)
UniCOS from Cray
Xenix (Microsoft's licensed version of Unix for various hardware platforms)
z/OS (latest version of IBM mainframe OS)


Generic/commodity, non-UNIX, and other




AOS, now called Bluebottle (a concurrent and active object update to the Oberon operating system)
AROS (Amiga Research Operating System)
Bluebottle (see AOS)
BS2000 by Siemens AG
Control Program/Monitor-80 (CPM operating system)
CP/M-86 (CP/M for Intel 8088/86 from Digital Research)
DESQView (windowing GUI for MS-DOS, ca 1985)
DR-DOS (MS-DOS compatible OS from Digital Research, later from Novell, Caldera, ..; still being used for special purpose projects)
FLEX9 (by TSC for Motorola 6809 based machines; successor to FLEX, which was for Motorola 6800 CPUs)
FreeDOS (an open source MS-DOS workalike)
GEM (GUI for MS-DOS / DR-DOS from Digital Research)
GEOS
MS-DOS (OS Microsoft purchased from Seattle Computer to use for IBM PC compatible machines)
MorphOS (by Genesi)
NetWare (by Novell)
NeXTStep (which, more or less, became Mac OS X by NeXT)
PC-DOS (IBM's version of MS-DOS for PC machines)
Pick (often licensed and renamed)
Plan 9, Inferno (networked OS originally from Bell Labs Computer Research)
Primos by Prime Computer
Mach (from OS kernel research at CMU; see NextStep)
MP/M-80 (Multi programming version of CP/M-86 from Digital Research)
NewOS
Oberon operating system/(developed at ETH-Zürich by Niklaus Wirth et al.) for the Ceres and Chameleon workstation projects. see also Oberon programming language
OS/2 (Windows/MS-DOS compatible operating system developed through a joint Microsoft-IBM alliance, but later abandoned by Microsoft when they chose to focus on Windows NT; a considerable technical improvement on both early Windows and MS-DOS. Not a commercial success. The Odin open source project adds Windows 9x compatibility to OS/2. See Sourceforge.com for details)
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)
OS-9000 (portable Unix emulating OS from Microware; one implementation was for Intel x86)
SSB-DOS (by TSC for Smoke Signal Broadcasting; a variant of FLEX in most respects)
TripOS
TUNES
QDOS (developed at Seattle Computer Products by Tim Paterson for the new Intel 808x CPUs; also called SCP-DOS; licensed to Microsoft -- became MS-DOS/PC-DOS)
UCSD P-system (portable complete programming environment/operating system developed by a long running student project at the Univ Calif/San Diego; directed by Prof Ken Bowles; written Pascal)
VisiOn (first GUI for early PC machines, not commercially successful)
Visopsys (hobby OS for PCs)
VME by International Computers Limited (ICL)
Randolf by United Computer inc,
Vision (first Gui for early PC machines, not commercially successful)Microware



Hobby OS

Operating systems written for a hobby.
ReactOS (an open source Windows NT workalike)
Panalix
MenuetOS
SkyOS (hobby / commercial desktop OS for PCs)