How to hide drive in windows

How to hide drive in windows

What is Windows Temporary Files

What is Windows Temporary Files

A Windows temporary file is created under the following three circumstances: 

1. Windows Desktop applications, such as Write, and multiple document interface (MDI) applications, such as Excel, create temporary files to handle necessary user editing.
   
   Because a Desktop application cannot have multiple documents open at once, it must immediately create a temporary file that allows you to undo any editing. MDI applications create temporary files only when necessary (for related editing), rather than for every worksheet that is open.
2. When you run an MS-DOS-based standard application with Windows/286, Windows/286 creates a temporary file (for example, ~PIFCHFA.TMP) so that it can swap to disk to make room for other applications to use memory.
3. When you print from Windows or any Windows-based application with the spooler enabled, Windows creates temporary files on the hard disk. Windows spools the print job to the temporary file and then sends it to the appropriate printer as a background operation.

Note: Microsoft recommends that you have approximately 2 megabytes (MB) of free disk space available for the creation of temporary files.

What to Do with Temporary Files

A number of files may appear on the hard drive in various directories beginning with a tilde character (~) and ending with a .TMP extension. These may be temporary files created by Windows that remain on the hard drive due to an irregular exit from a Windows session. 

Under normal conditions, these files are closed and deleted by Windows when you quit a Windows session. However, if you quit Windows in an irregular way (for example, restarting the computer or turning it off during an active Windows session) the files are not closed or deleted. 

The temporary files should be located in a designated subdirectory of their own. If temporary files appear in the root directory, you may have an invalid SET TEMP statement. Check for the following conditions: 

1. Using a text editor, such as Microsoft Windows Notepad, open the AUTOEXEC.BAT file and make sure it includes a valid SET TEMP statement. This statement should be similar to the following:

   SET TEMP=C:\WINDOWS\TEMP
         

2. Note the path that the SET TEMP statement points to and check to ensure that such a subdirectory does exist. If not, create a subdirectory to match the SET TEMP statement.
3. If the SET TEMP statement is pointing to a RAM drive, make sure the RAM drive is large enough to hold the temporary files being created.

By ensuring that there is a valid SET TEMP statement and a separate subdirectory for temporary files, these files can easily be deleted on a regular basis. 

To delete a temporary file, use the following steps:

1. Close Windows.
2. From the MS-DOS command prompt, change to the TEMP directory.
3. Delete any existing .TMP files. Make sure Windows is not running at the time these files are deleted. Some of these .TMP files may be files that Windows is using.

Office 2013 keys

1. Install Office 2013
2. Before activate disconnect internet! Open Word 2013
3. Use the activation key above
4.Enter the product key
5.Activation wizard click phone activation
6. Next step select UK and use skype for free call above free number ***[This step you can reconnect internet again]
7. Dial phone and if you have been ask:
Q:Product key for home or business
A:Home [Dial 1]
after giving installation ID final question
Q:How many computer you want to use it
A:1 [Dial 1]
8.You will get Confirmation ID. Use the Conf. ID then next to activate it.
OFFICE 2013 PRO PLUS Offline Activation RETAIL Keys [Retail Edition Only]:
[New Key1]: 9RN4T-JPBQV-XQMC9-PM9FP-PGWP9
[New Key2]: N9M8X-QDKGK-W27Q6-2GQYT-TJC9K
[New Key3]: 6PVPD-CNWDQ-G734C-DG7BM-VQTXK
[New Key3]: JPMTN-GW9J2-QH2GT-XMQTD-7T7TX
[New Key5]: 27NBW-JF64Y-37YWH-JYG9G-D3TXK
[Tested working on 06 March 2013]

=========================================================================================

OFFICE 2013 VISIO PRO PLUS MSDN RETAIL:
[New Key1]: NCDH3-4R7FX-W3HGV-KDF7V-T28RD
[Tested working on 06 March 2013]

=========================================================================================

OFFICE 2013 PROJECT PRO PLUS MSDN RETAIL:
[New Key1]: VV7FP-BHN3B-T2J7D-7HKH7-VT7R7
[Tested working on 06 March 2013]



=========================================================================================

Office 2013 Pro Offline Activation MAK Keys [Volume License Edition Only]
ND9QV-R6QV9-KWYYX-Q4X28-DGKKV

[Tested working on 06 March 2013]

Microsoft Office Professional Plus 2013 Full Version with serial free download

Microsoft Office Professional Plus 2013 Full Version with serial free download

 Who does not know with one of the most popular software in this world. Microsoft Office Professional Plus 2013 Preview. Yes, after Office 2007 and Office 2010 Microsoft today unveiled Microsoft Office Professional Plus 2013 Preview. Microsoft Office Professional Plus 2013 Preview you can enjoy them for free because it is still beta.

System Requirements:

• 1 Ghz Processore (32 Bit or 64 Bit)
• 1 GB of RAM (32 bit) or 2 GB of RAM (64 Bit)
• 3 GB Hard Drive Space
• Operating System: Windows 7, Windows 8, Windows Server 2008 R2,Windows Server 2012
• Net Framework 3.5, 4.0, Or 4.5

 Here is How To Activate Office 2013 Preview, Listen carefully:

1. First you first install Office 2013 Preview
   * If you have Office 2007 or 2010, please uninstall it first
2. After Install, Do not run the first Office 2013. Relaxed first brooo ... Hehe
3. Now we ask first series, do please read Step 4
4. CLICK HERE to get Free Serial Number that you can use up to 5 users.
5. Please LOGIN using your Hotmail or Live email
   * If do not have, please make aja just select the SIGNUP 
6. After that will come 'Microsoft Office Professional Plus 2013 Preview'
7. The data contents - Then Continue - Wait a minute
8. TARAAAAA! Serial successful you get. Go to Step 9
9. Run Office 2013 (It is up to Word, Excel, or Powerpoint) - Select the Blank Document
10. Then the menu FILE - ACCOUNT - Change Product Key 
11. Enter a Serial which you'd get - INSTALL
    * Must be in a state ONLINE Yes!         

   Download via Microsoft (Single Link): 

• Download | 32 Bit | Microsoft Office Professional Plus 2013 Preview - (625 MB)
• Download | 64 Bit | Microsoft Office Professional Plus 2013 Preview - (702 MB)

    

How to Use God Mode in Windows 7

How to Use God Mode in Windows 7

How to Use God Mode in Windows 7
Windows 7 is now becoming popular among windows operating system  users.Windows 7 has cool hidden feature ,people calls it godmode in windows 7.GodMode is a folder that brings together a long list of customization settings allowing you to change all your settings from one place.This is very good as you can now change all your windows settings from one single place

God Mode in Windows 7

Foll the following steps to create god mode folder:
1. Create a new folder
2. Rename the folder to GodMode.{ED7BA470-8E54-465E-825C-99712043E01C}
You can change word GodMode to any other word you like your name or your friends name

3.The folder icon will change ,then  double click it to show the GodMode windows options.

@Enjoy hacking Niranjan
.......................................................................................................................................................................................................

how to end a process with cmd.

how to end a process with cmd.
open cmd  then cheak tasks in process.
C:\Users\sonu>tasklist

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
System Idle Process              0 Services                   0         24 K
System                           4 Services                   0        976 K
smss.exe                       312 Services                   0        752 K
csrss.exe                      464 Services                   0      3,036 K
wininit.exe                    544 Services                   0      4,016 K
csrss.exe                      560 Console                    1     25,808 K
services.exe                   596 Services                   0      7,928 K
winlogon.exe                   636 Console                    1      4,904 K
lsass.exe                      648 Services                   0      7,592 K
lsm.exe                        656 Services                   0      3,412 K
svchost.exe                    780 Services                   0      6,860 K
svchost.exe                    888 Services                   0      6,464 K
Ati2evxx.exe                   936 Services                   0      4,048 K
svchost.exe                   1008 Services                   0     14,936 K
svchost.exe                   1056 Services                   0     52,580 K
svchost.exe                   1088 Services                   0     25,968 K
audiodg.exe                   1176 Services                   0     22,600 K
svchost.exe                   1240 Services                   0     11,108 K
svchost.exe                   1408 Services                   0     12,040 K
Ati2evxx.exe                  1452 Console                    1      6,428 K
svchost.exe                   1628 Services                   0     12,616 K
AvastSvc.exe                  1656 Services                   0     16,000 K
spoolsv.exe                   1788 Services                   0      8,656 K
armsvc.exe                    1992 Services                   0      3,240 K
HWDeviceService.exe           2036 Services                   0      4,676 K
taskhost.exe                  1388 Console                    1      7,536 K
dwm.exe                       1952 Console                    1     75,092 K
explorer.exe                  2140 Console                    1     71,904 K
ouc.exe                       2152 Services                   0      4,484 K
DCSHelper.exe                 2208 Console                    1      5,320 K
UAService.exe                 2252 Services                   0      1,956 K
WUDFHost.exe                  2460 Services                   0      5,212 K
AvastUI.exe                   2684 Console                    1      9,276 K
DCSHelper.exe                 2916 Console                    1      5,616 K
RtHDVCpl.exe                  2940 Console                    1     10,960 K
MOM.exe                       2952 Console                    1      4,196 K
idman.exe                     3012 Console                    1     13,600 K
Idea Net Setter.exe           3052 Console                    1     42,524 K
CCC.exe                       3352 Console                    1      5,584 K
WmiPrvSE.exe                  3496 Services                   0      7,380 K
SearchIndexer.exe             3768 Services                   0     10,572 K
svchost.exe                   2896 Services                   0      8,644 K
vlc.exe                       4060 Console                    1     29,444 K
chrome.exe                    3388 Console                    1    116,680 K
chrome.exe                    2184 Console                    1     48,320 K
chrome.exe                    2532 Console                    1     48,224 K
chrome.exe                     908 Console                    1    114,632 K
chrome.exe                    2960 Console                    1     65,336 K
sppsvc.exe                     200 Services                   0      4,452 K
svchost.exe                   2468 Services                   0     15,316 K
wmpnetwk.exe                  1428 Services                   0      5,424 K
chrome.exe                    4368 Console                    1     55,524 K
chrome.exe                    5672 Console                    1     84,780 K
chrome.exe                    4324 Console                    1     76,420 K
chrome.exe                    4596 Console                    1     78,188 K
chrome.exe                    2544 Console                    1     73,384 K
cmd.exe                       3740 Console                    1      2,824 K
conhost.exe                   4936 Console                    1      5,552 K
chrome.exe                    5524 Console                    1     69,708 K
notepad.exe                   5116 Console                    1      7,092 K
tasklist.exe                  5876 Console                    1      4,508 K

C:\Users\sonu>taskkill /?

TASKKILL [/S system [/U username [/P [password]]]]
         { [/FI filter] [/PID processid | /IM imagename] } [/T] [/F]

Description:
    This tool is used to terminate tasks by process id (PID) or image name.

Parameter List:
    /S    system           Specifies the remote system to connect to.

    /U    [domain\]user    Specifies the user context under which the
                           command should execute.

    /P    [password]       Specifies the password for the given user
                           context. Prompts for input if omitted.

    /FI   filter           Applies a filter to select a set of tasks.
                           Allows "*" to be used. ex. imagename eq acme*

    /PID  processid        Specifies the PID of the process to be terminated.
                           Use TaskList to get the PID.

    /IM   imagename        Specifies the image name of the process
                           to be terminated. Wildcard '*' can be used
                           to specify all tasks or image names.

    /T                     Terminates the specified process and any
                           child processes which were started by it.

    /F                     Specifies to forcefully terminate the process(es).

    /?                     Displays this help message.

Filters:
    Filter Name   Valid Operators           Valid Value(s)
    -----------   ---------------           -------------------------
    STATUS        eq, ne                    RUNNING |
                                            NOT RESPONDING | UNKNOWN
    IMAGENAME     eq, ne                    Image name
    PID           eq, ne, gt, lt, ge, le    PID value
    SESSION       eq, ne, gt, lt, ge, le    Session number.
    CPUTIME       eq, ne, gt, lt, ge, le    CPU time in the format
                                            of hh:mm:ss.
                                            hh - hours,
                                            mm - minutes, ss - seconds
    MEMUSAGE      eq, ne, gt, lt, ge, le    Memory usage in KB
    USERNAME      eq, ne                    User name in [domain\]user
                                            format
    MODULES       eq, ne                    DLL name
    SERVICES      eq, ne                    Service name
    WINDOWTITLE   eq, ne                    Window title

    NOTE
    ----
    1) Wildcard '*' for /IM switch is accepted only when a filter is applied.
    2) Termination of remote processes will always be done forcefully (/F).
    3) "WINDOWTITLE" and "STATUS" filters are not considered when a remote
       machine is specified.

Examples:
    TASKKILL /IM notepad.exe
    TASKKILL /PID 1230 /PID 1241 /PID 1253 /T
    TASKKILL /F /IM cmd.exe /T
    TASKKILL /F /FI "PID ge 1000" /FI "WINDOWTITLE ne untitle*"
    TASKKILL /F /FI "USERNAME eq NT AUTHORITY\SYSTEM" /IM notepad.exe
    TASKKILL /S system /U domain\username /FI "USERNAME ne NT*" /IM *
    TASKKILL /S system /U username /P password /FI "IMAGENAME eq note*"

C:\Users\sonu>taskkill /im vlc.exe
SUCCESS: Sent termination signal to the process "vlc.exe" with PID 4060.

C:\Users\sonu>taskkill /im notepad.exe
SUCCESS: Sent termination signal to the process "notepad.exe" with PID 5116.

C:\Users\sonu>

how to change permision in windows folder

how to change permision in windows folder
1.select a file then right click and go to property.

2.click on security tab
3.group or user names

4. edit
5.then click on current user name
6. after that click on all allow tab.

enjoy hacking @NIRANJAN

opreating system lists

opreating system lists

Acorn Computers

ARX
Arthur
RISC OS
MOS
Panos
RISC iX

Amiga Inc.

AmigaOS
AmigaOS 1.0-3.9 (Motorola 68000)
AmigaOS 4 (PowerPC)
Amiga Unix (aka Amix)

Apollo Computer

Domain/OS : One of the first network-based systems. Run on Apollo/Domain hardware. Later bought by Hewlett-Packard.

Apple Inc.

For Apple II

Apple DOS
UCSD Pascal
ProDOS
GS/OS

For Apple III

SOS (Sophisticated Operating System)

For Apple Lisa

Lisa OS

For Apple Newton

Newton OS

Classic Mac OS

System Software 1
System Software 2
System Software 3
System Software 4
System Software 5
System 6
System 7
For 68k CPUs
System 7 (codenamed "Big Bang")
For Intel 386 CPUs
"Star Trek" (System 7.1 running on DR DOS "StarTrek", a Novell DOS 7 precursor)
Mac OS 8
Mac OS 9

Unix-like operating systems

For Macintosh Computers
For 68k CPUs
A/UX
For PowerPC CPUs
MkLinux
Mac OS X v10.0 (aka "Cheetah")
Mac OS X v10.1 (aka "Puma")
Mac OS X v10.2 (aka "Jaguar")
Mac OS X v10.3 (aka "Panther")
For PowerPC and Intel CPUs
Mac OS X
Mac OS X v10.4 (aka "Tiger")
Mac OS X v10.5 (aka "Leopard")
For Intel CPUs
Mac OS X
Mac OS X v10.6 (aka "Snow Leopard")
Mac OS X v10.7 (aka "Lion")
Mac OS X v10.8 (aka "Mountain Lion") (From this point on it will no long be called "Mac OS X" it will be called "OS X")
Mac OS X Server
For iPhone/iPod Touch/iPad/Apple TV
iOS

Atari

Atari DOS (for 8-bit computers)
Atari TOS
Atari MultiTOS
Template:Min ti

BAE Systems

XTS-400

Be Inc.

BeOS
BeIA
BeOS r5.1d0
magnussoft ZETA (based on BeOS r5.1d0 source code, developed by yellowTAB)

Bell Labs

Unics ("Ken's new system," for its creator (Ken Thompson), officially Unics and then Unix, the prototypic operating system created in Bell Labs in 1969 that formed the basis for the Unix family of operating systems)
UNIX Time-Sharing System v1
UNIX Time-Sharing System v2
UNIX Time-Sharing System v3
UNIX Time-Sharing System v4
UNIX Time-Sharing System v5
UNIX Time-Sharing System v6
MINI-UNIX
PWB/UNIX
USG
CB Unix
UNIX Time-Sharing System v7 (It is from Version 7 Unix (and, to an extent, its descendants listed below) that almost all Unix-based and Unix-like operating systems descend.)
Unix System III
Unix System IV
Unix System V
Unix System V Releases 2.0, 3.0, 3.2, 4.0, and 4.2
UNIX Time-Sharing System v8
UNIX TIme-Sharing System v9
UNIX Time-Sharing System v10

Non-Unix Operating Systems:

BESYS
Plan 9 from Bell Labs

Bull SAS

GCOS

Burroughs Corporation

Burroughs MCP

Control Data Corporation

Chippewa Operating System (COS)
SIPROS (for Simultaneous Processing Operating System)
SCOPE (Supervisory Control Of Program Execution)
MACE (Mansfield and Cahlander Executive)
Kronos (Kronographic OS)
NOS (Network Operating System)
NOS/BE NOS Batch Environment
EP/IX (Enhanced Performance Unix)

Convergent Technologies

Convergent Technologies Operating System (later acquired by Unisys)

Data General

RDOS Real-time Disk Operating System, with variants: RTOS and DOS (not related to IBM PC DOS).
AOS for 16-bit Data General Eclipse computers and AOS/VS for 32-bit (MV series) Eclipses, MP/AOS for microNOVA-based computers
DG/UX

DataPoint

CTOS Z-80 based, Cassette Tape Operating System for early desktop systems. Capable of up to 8 simultaneous users. Replaced by DataPoint DOS.
DOS Intel 808x/80x86-based, Disk Operating Systems for desktop systems. Capable of up to 32 users per node. Supported a sophisticated network of nodes that were often purpose-built. The name DOS was used in these products login screens before it was popularized by IBM, Microsoft and others.

DDC-I, Inc.

Deos Time & Space Partitioned RTOS, Certified to DO-178B, Level A since 1998
HeartOS Posix-based Hard Real-Time Operating System

Digital Research, Inc.

CP/M CP/M for Intel 8080/8085 and Zilog Z80
Personal CP/M, a refinement of CP/M 2.2 with BDOS 2.8
CP/M Plus with BDOS 3.0
CP/M-68K CP/M for Motorola 68000
CP/M-8000 CP/M for Zilog Z8000
CP/M-86 CP/M for Intel 8088/8086
CP/M-86 Plus
Personal CP/M-86

MP/M Multi-user version of CP/M-80
MP/M II
MP/M-86 Multi-user version of CP/M-86
MP/M 8-16, a dual-processor variant of MP/M for 8086 and 8080 CPUs.

Concurrent CP/M, the successor of CP/M-80 and MP/M-80
Concurrent CP/M-86, the successor of CP/M-86 and MP/M-86
Concurrent CP/M 8-16, a dual-processor variant of Concurrent CP/M for 8086 and 8080 CPUs.
Concurrent CP/M-68K, a variant for the 68000

Concurrent DOS, the successor of Concurrent CP/M-86 with PC-MODE
Concurrent PC DOS, a Concurrent DOS variant for IBM compatible PCs
Concurrent DOS 8-16, a dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs.
Concurrent DOS 286
Concurrent DOS XM, a real-mode variant of Concurrent DOS with EEMS support
Concurrent DOS 386
Concurrent DOS 386/MGE, a Concurrent DOS 386 variant with advanced graphics terminal capabilities
Concurrent DOS 68K, a port of Concurrent DOS to Motorola 68000 CPUs with DOS source code portability capabilities

FlexOS 1.0 - 2.34, a derivative of Concurrent DOS 286
FlexOS 186, a variant of FlexOS for terminals
FlexOS 286, a variant of FlexOS for hosts
Siemens S5-DOS/MT, an industrial control system based on FlexOS
IBM 4680 OS, a POS operating system based on FlexOS
IBM 4690 OS, a POS operating system based on FlexOS
FlexOS 386, a later variant of FlexOS for hosts
IBM 4690 OS, a POS operating system based on FlexOS
FlexOS 68K, a derivative of Concurrent DOS 68K

Multiuser DOS, the successor of Concurrent DOS 386
CCI Multiuser DOS
Datapac Multiuser DOS
Datapac System Manager, a derivative of Datapac Multiuser DOS
IMS Multiuser DOS
IMS REAL/32, a derivative of Multiuser DOS
IMS REAL/NG, the successor of REAL/32

DOS Plus 1.2 - 2.1, a single-user, multi-tasking system derived from Concurrent DOS 4.1 - 5.0

DR DOS 3.31 - 6.0, a single-user, single-tasking native DOS derived from Concurrent DOS 6.0
Novell PalmDOS 1.0
Novell "Star Trek"
Novell DOS 7, a single-user, multi-tasking system derived from DR DOS
Caldera OpenDOS 7.01
Caldera DR-DOS 7.02 and higher

Digital/Tandem Computers/Compaq/HP

OS/8
ITS (for the PDP-6 and PDP-10)
Multi-Programming Executive (from HP)
TOPS-10 (for the PDP-10)
WAITS (for the PDP-6 and PDP-10)
TENEX (from BBN, for the PDP-10)
TOPS-20 (for the PDP-10)
RSTS/E (multi-user time-sharing OS for PDP-11s)
RSX-11 (multiuser, multitasking OS for PDP-11s)
RT-11 (single user OS for PDP-11)
VMS (originally by DEC, now by HP) for the VAX mini-computer range, Alpha and Intel Itanium 2; later renamed OpenVMS)
Domain/OS (originally Aegis, from Apollo Computer who were bought by HP)
Digital UNIX (derived from OSF/1, became HP's Tru64 UNIX)
HP-UX
Ultrix

ENEA AB

OSE Flexible, small footprint, high-performance RTOS for control processors

Fujitsu

Towns OS

Google
Android 4.0.1 on the Galaxy Nexus

Google Chrome OS is designed to work exclusively with web applications. Announced on July 7, 2009, Chrome OS is currently publicly available and was released summer 2011. The Chrome OS source code was released on November 19, 2009 under the BSD license as Chromium OS.

Chromium OS is an open source operating system development version of Google Chrome OS. Both operating systems are based on the Ubuntu kernel.

Android is an operating system for mobile devices. Android is based on Linux core.

Green Hills Software

INTEGRITY Reliable Operating system
INTEGRITY-178B A DO-178B certified version of INTEGRITY.
µ-velOSity A lightweight microkernel.

Heathkit/Zenith Data Systems

HDOS; ran on the H8 and Heath/Zenith Z-89 series
HT-11 (a modified version of RT-11) ran on the Heathkit H11

Hewlett-Packard

HP Multi-Programming Executive; (MPE, MPE/XL, and MPE/iX) runs on HP 3000 and HP e3000 mini-computers.
HP-UX; runs on HP9000 and Itanium servers - from small to mainframe-class computers.

Honeywell

Multics
GCOS
HeartOS

Intel Corporation

iRMX; real-time operating system originally created to support the Intel 8080 and 8086 processor families in embedded applications.
ISIS-II; "Intel Systems Implementation Supervisor" was THE environment for development of software within the Intel microprocessor family in the early 1980s on their Intellec Microcomputer Development System and clones. ISIS-II worked with 8 inch floppy disks and had an editor, cross-assemblers, a linker, an object locator, debugger, compilers for PLM (PL/I for microprocessors of the 8080/86 family), a BASIC interpreter, etc. and allowed file management through a console.

IBM
Further information: History of IBM mainframe operating systems
On early IBM mainframes (1400, 1800, 701, 704, 709, 7090, and 7094)

BESYS (for the IBM 7090)
CTSS (The Compatible Time-Sharing System, developed at MIT's Computation Center for use on a modified IBM 7094)
GM OS & GM-NAA I/O (for the IBM 704)
IBSYS (tape based operating system for IBM 7090 and IBM 7094)
IJMON (A bootable serial I/O monitor for loading programs for IBM 1400 and IBM 1800)
SOS (SHARE Operating System, for the IBM 704 and 709)
UMES (University of Michigan Executive System, for the IBM 704, 709, and 7090)

On IBM S/360, S/370, and successor mainframes

OS/360 and successors on IBM S/360, S/370, and successor mainframes
OS/360 (first official OS targeted for the System/360 architecture),
Saw customer installations of the following variations:
PCP (Primary Control Program, a kernel and a ground breaking automatic space allocating file system)
MFT (original Multi-programming with a Fixed number of Tasks, replaced by MFT II)
MFT II (Multi-Programming with a Fixed number of Tasks, had up to 15 fixed size application partitions, plus partitions for system tasks, initially defined at boot time but redefinable by operator command)
MVT (Multi-Programming Variable Tasks, had up to 15 application regions defined dynamically, plus additional regions for system tasks)
OS/VS (port of OS/360 targeted for the System/370 virtual memory architecture, "OS/370" is not correct name for OS/VS1 and OS/VS2, but rather refers to OS/VS2 MVS and MVS/SP Version 1),
Customer installations in the following variations:
SVS (Single Virtual Storage, both VS1 & VS2 began as SVS systems)
OS/VS1 (Operating System/Virtual Storage 1, Virtual-memory version of MFT II)
OS/VS2 (Operating System/Virtual Storage 2, Virtual-memory version of OS/MVT but without multiprocessing support)
OS/VS2 R2 (called Multiple Virtual Storage, MVS, eliminated most need for VS1)
MVS/SE (MVS System Extensions)
MVS/SP (MVS System Product)
MVS/XA (MVS/SP V2. MVS supported eXtended Architecture, 31-bit addressing)
MVS/ESA (MVS supported Enterprise System Architecture, horizontal addressing extensions: data only address spaces called Dataspaces; a Unix environment was available starting with MVS/ESA V4R3)
OS/390 (Upgrade from MVS, with an additional Unix environment)
z/OS (OS/390 supported z/Architecture, 64-bit addressing)

DOS/360 and successors on IBM S/360, S/370, and successor mainframes
BOS/360 (early interim version of DOS/360, briefly available at a few Alpha & Beta System/360 sites)
TOS/360 (similar to BOS above and more fleeting, able to boot and run from 2x00 series tape drives)
DOS/360 (Disk Operating System (DOS), multi-programming system with up to 3 partitions, first commonly available OS for System/360)
DOS/360/RJE (DOS/360 with a control program extension that provided for the monitoring of remote job entry hardware (card reader & printer) connected by dedicated phone lines)
DOS/VS (First DOS offered on System/370 systems, provided virtual storage)
DOS/VSE (also known as VSE, upgrade of DOS/VS, up to 14 fixed size processing partitions )
VSE/SP (program product replacing DOS/VSE and VSE/AF)
VSE/ESA (DOS/VSE extended virtual memory support to 32-bit addresses (Extended System Architecture)).
z/VSE (latest version of the four decades old DOS lineage, supports 64-bit addresses, multiprocessing, multiprogramming, SNA, TCP/IP, and some virtual machine features in support of Linux workloads)

CP/CMS (Control Program/Cambridge Monitor System) and successors on IBM S/360, S/370, and successor mainframes

CP-40/CMS (for System/360 Model 40)
CP-67/CMS (for System/360 Model 67)
VM/370 (Virtual Machine / Conversational Monitor System, virtual memory operating system for System/370)
VM/XA (VM/eXtended Architecture for System/370 with extended virtual memory)
VM/ESA (Virtual Machine / Extended System Architecture, added 31-bit addressing to VM series)
z/VM (z/Architecture version of the VM OS with 64-bit addressing)

Further information: History of CP/CMS

TPF Line (Transaction Processing Facility) on IBM S/360, S/370, and successor mainframes (largely used by airlines)
ACP (Airline Control Program)
TPF (Transaction Processing Facility)
z/TPF (z/Architecture extension)

Unix-like on IBM S/360, S/370, and successor mainframes
AIX/370 (IBM's Advanced Interactive eXecutive, a System V Unix version)
AIX/ESA (IBM's Advanced Interactive eXecutive, a System V Unix version)
OpenSolaris for IBM System z
UTS (developed by Amdahl)
z/Linux

Others on IBM S/360, S/370, and successor mainframes:
BOS/360 (Basic Operating System)
MTS (Michigan Terminal System for IBM System/360)
RTOS/360 (IBM's Real Time Operating System, ran on 5 NASA custom System/360-75s)
TOS/360 (Tape Operating System)
TSS/360 (IBM's Time Sharing System)
MUSIC/SP (developed by McGill University for IBM System/370)
ORVYL and WYLBUR (developed by Stanford University for IBM System/360)

On IBM PC and Intel x86 based architectures

PC DOS / IBM DOS
PC DOS 1.x, 2.x, 3.x (developed jointly with Microsoft)
IBM DOS 4.x, 5.0 (developed jointly with Microsoft)
PC DOS 6.1, 6.3, 7, 2000, 7.10

See also: MS-DOS and Windows

OS/2
OS/2 1.x (developed jointly with Microsoft)
OS/2 2.x
OS/2 Warp 3
OS/2 Warp 4
eComStation (Warp 4.5/Workspace on Demand, rebundled by Serenity Systems International)
4680 OS version 1 to 4, a POS operating system based on Digital Research's Concurrent DOS 286 and FlexOS 286 1.xx
4690 OS version 1 to 6.2, a successor to 4680 OS based on Novell's FlexOS 286/FlexOS 386 2.3x

On other IBM hardware platforms

IBM Series/1
EDX (Event Driven Executive)
RPS (Realtime Programming System)
CPS (Control Programming Support, subset of RPS)
SerIX (Unix on Series/1)

IBM 1130
DMS (Disk Monitor System)

IBM 1800
TSX (Time Sharing eXecutive)
MPX (Multi Programming eXecutive)

IBM 8100
DPCX (Distributed Processing Control eXecutive)
DPPX (Distributed Processing Programming Executive)

IBM System/3
DMS (Disk Management System)

IBM System/34, IBM System/36
SSP (System Support Program)

IBM System/38
CPF (Control Program Facility)

IBM System/88
Stratus VOS (developed by Stratus, and used for IBM System/88, Original equipment manufacturer from Stratus)

AS/400, iSeries, System i, Power Systems i Edition
OS/400 (descendant of System/38 CPF, include System/36 SSP environment)
i5/OS (extends OS/400 with significant interoperability features)
IBM i (extends i5/OS)

UNIX on IBM POWER
AIX (Advanced Interactive eXecutive, a System V Unix version)
AOS (a BSD Unix version, not related to Data General AOS)

Others
IBM Workplace OS (Microkernel based operating system, developed and canceled in 1990s)
K42 (open-source research operating system on PowerPC or x86 based cache-coherent multiprocessor systems)
Dynix (developed by Sequent, and used for IBM NUMA-Q too)

International Computers Limited

J and MultiJob for the System 4 series mainframes
GEORGE 2/3/4 GEneral ORGanisational Environment, used by ICL 1900 series mainframes
Executive, used on the 290x range of minicomputers
TME, used on the ME29 minicomputer
ICL VME, including early variants VME/B VME/K, appearing on the ICL 2900 Series and Series 39 mainframes, implemented in S3.

LynuxWorks (originally Lynx Real-time Systems)

LynxOS

Micrium Inc.

MicroC/OS-II (Small pre-emptive priority based multi-tasking kernel)
MicroC/OS-III (Small pre-emptive priority based multi-tasking kernel, with unlimited number of tasks and priorities, and round robin scheduling)

Microsoft

Xenix (licensed version of Unix; licensed to SCO in 1987)
MSX-DOS (developed by MS Japan for the MSX 8-bit computer)
MS-DOS (developed jointly with IBM, versions 1.0–6.22)
Windows 1.0 (Windows 1 - Based on Visi-On) April 30, 1985
Windows 2.0 (Windows 2) December 9, 1987
Windows 3.0 (Windows 3 - Is the first version of Windows to make substantial commercial impact) May 22, 1990
Windows 3.1x (Windows 3.1) March 18, 1992
Windows 3.2 (Chinese-only release) November 19, 1992
Windows for Workgroups 3.11 January 21, 1993
Windows 95 (Windows 4) August 24, 1995
Windows 98 (Windows 4.1) June 25, 1998
Windows Millennium Edition (Windows Me - Windows 4.9) September 14, 2000
Windows NT (Full 32-bit kernel, not dependent on MS-DOS)
Windows NT 3.1 July 27, 1993
Windows NT 3.5 September 21, 1994
Windows NT 3.51 May 30, 1995
Windows NT 4.0 July 31, 1996
Windows 2000 (Windows NT 5.0), February 17, 2000
Windows XP (Windows NT 5.1) October 25, 2001
Windows Server 2003 (Windows NT 5.2) April 24, 2003
Windows Fundamentals for Legacy PCs (based on Windows XP) July 8, 2006
Windows Vista (Windows NT 6.0) January 31, 2007
Windows Azure (based on Windows Vista) 2009
Windows Home Server (based on Windows Server 2003) February 28, 2008
Windows Server 2008 (based on Windows Vista) February 28, 2008
Windows 7 (Windows NT 6.1) October 22, 2009
Windows 7 Extreme Ultimate (Windows NT 6.3) (developed by Nilanjan Chakraborty, A school student) March 22,2010
Windows Server 2008 R2 (based on Windows 7) October 22, 2009
Windows Home Server 2011 (based on Windows Server 2008 R2) April 6, 2011
Windows 8 Consumer Preview (First downloadable release) March 1, 2012
Windows 8 Server Beta (First downloadable release) March 15, 2012
Windows CE (OS for handhelds, embedded devices, and real-time applications that is similar to other versions of Windows) May 30, 2002
Windows CE 3.0 December 25, 2002
Windows CE 5.0 February 27, 2004
Windows CE 6.0 May 5, 2004
Windows Mobile (based on Windows CE, but for a smaller form factor) April 14, 2005
Windows Phone October 21, 2010
Singularity - A research operating system written mostly in managed code (C#) November 30, 2009
Midori - A managed code operating system July 21, 2010
Xbox and Xbox 360 OS custom operating systems May 12, 2005 and August 10, 2006

Minuet OS

Minute OS
Kolibri OS

both these operating systems were designed to fit on a single 3.5" floppy disc.
MontaVista Software

MontaVista Linux
MontaVista Mobilinux

NCR Corporation

TMX - Transaction Management eXecutive

Novell

NetWare network operating system providing high-performance network services. Has been superseded by Open Enterprise Server line, which can be based on NetWare or Linux to provide the same set of services.
Open Enterprise Server, the successor to NetWare.

Quadros Systems

RTXC Quadros RTOS proprietary C-based RTOS used in embedded systems

RCA

TSOS, first OS supporting virtual addressing of the main storage and support for both timeshare and batch interface

RoweBots

Unison RTOS Ultra Tiny Embedded Linux Compatible RTOS
DSPnano RTOS Ultra Tiny Embedded Linux Compatible RTOS
Unison/Reliant V3 pSOS derivative RTOS

SCO / The SCO Group[1]

Xenix, Unix System III based distribution for the Intel 8086/8088 architecture
Xenix 286, Unix System V Release 2 based distribution for the Intel 80286 architecture
Xenix 386, Unix System V Release 2 based distribution for the Intel 80386 architecture
SCO Unix, SCO UNIX System V/386 was the first volume commercial product licensed by AT&T to use the UNIX System trademark (1989). Derived from AT&T System V Release 3.2 with an infusion of Xenix device drivers and utilities plus most of the SVR4 features
SCO Open Desktop, the first 32-bit graphical user interface for UNIX Systems running on Intel processor-based computers. Based on SCO Unix
SCO OpenServer 5, AT&T UNIX System V Release 3 based
SCO OpenServer 6, SVR5 (UnixWare 7) based kernel with SCO OpenServer 5 application and binary compatibility, system administration, and user environments
UnixWare
UnixWare 2.x, based on AT&T System V Release 4.2MP
UnixWare 7, UnixWare 2 kernel plus parts of 3.2v5 (UnixWare 2 + OpenServer 5 = UnixWare 7). Referred to by SCO as SVR5

Scientific Data Systems (SDS)

Berkeley Timesharing System for the SDS 940

SYSGO

PikeOS is a certified real time operating system for safety and security critical embedded systems

TRON Project

TRON (open real-time operating system kernel)
T-Kernel

Unisys

Unisys OS 2200 operating system

UNIVAC (later Unisys)

EXEC I
EXEC II
EXEC 8 Ran on 1100 series.
VS/9, successor to RCA TSOS

Wang Laboratories

WPS Wang Word Processing System. Micro-code based system.
OIS Wang Office Information System. Successor to the WPS. Combined the WPS and VP/MVP systems.

Wind River Systems

VxWorks Small footprint, scalable, high-performance RTO

Other
Lisp-based

Symbolics Genera written in a systems dialect of the Lisp programming language called ZetaLisp and Symbolics Common Lisp. Genera was ported to a virtual machine for the DEC Alpha line of computers.
Texas Instruments' Explorer Lisp machine workstations also had systems code written in Lisp Machine Lisp.
The Xerox 1100 series of Lisp machines ran an operating system written in Interlisp that was also ported to virtual machine called "Medley."
Lisp Machines, Inc. also known as LMI, also ran an operating system based on MIT's Lisp Machine Lisp.

Non-standard language-based

The Mesa programming language was used to implement the Pilot operating system, used in Xerox Star workstations.
PERQ Operating System (POS) was written in PERQ Pascal.

Other proprietary non-Unix-like

Эльбрус-1 (Elbrus-1) and Эльбрус-2 used for application, job control, system programming [1], implemented in uЭль-76 (AL-76).
EOS; developed by ETA Systems for use in their ETA-10 line of supercomputers
EMBOS; developed by Elxsi for use on their mini-supercomputers
GCOS is a proprietary Operating System originally developed by General Electric
PC-MOS/386; DOS-like, but multiuser/multitasking
SINTRAN III; an operating system used with Norsk Data computers.
THEOS
TRS-DOS; A floppy-disk-oriented OS supplied by Tandy/Radio Shack for their Z80-based line of personal computers.
NewDos/80; A third-party OS for Tandy's TRS-80 personal computers.
TX990/TXDS, DX10 and DNOS; proprietary operating systems for TI-990 minicomputers
MAI Basic Four; An OS implementing Business Basic from MAI Systems.
Michigan Terminal System; Developed by a group of American universities for IBM 360 series mainframes
MUSIC/SP; an operating system developed for the S/370, running normally under VM
SkyOS; commercial desktop OS for PCs
TSX-32; a 32-bit operating system for x86 platform.
OS ES; an operating system for ES EVM
Prolog-Dispatcher; used to control Soviet Buran space ship.

Other proprietary Unix-like and POSIX-compliant

Aegis (Apollo Computer)
Amiga Unix (Amiga ports of Unix System V release 3.2 with Amiga A2500UX and SVR4 with Amiga A3000UX. Started in 1989, last version was in 1992)
CLIX (Intergraph's System V implementation)
Coherent (Unix-like OS from Mark Williams Co. for PC class computers)
DC/OSx (DataCenter/OSx was an operating system for MIPS based systems developed by Pyramid Technology)
DG/UX (Data General Corp)
DNIX from DIAB
DSPnano RTOS (POSIX nanokernel, DSP Optimized, Open Source)
Interactive Unix (a port of the UNIX System V operating system for Intel x86 by Interactive Systems Corporation)
IRIX from SGI
MeikOS
NeXTSTEP (developed by NeXT; a Unix-based OS based on the Mach microkernel)
OS-9 Unix-like RTOS. (OS from Microware for Motorola 6809 based microcomputers)
OS9/68K Unix-like RTOS. (OS from Microware for Motorola 680x0 based microcomputers; based on OS-9)
OS-9000 Unix-like RTOS. (OS from Microware for Intel x86 based microcomputers; based on OS-9, written in C)
OSF/1 (developed into a commercial offering by Digital Equipment Corporation)
OpenStep
QNX (POSIX, microkernel OS; usually a real time embedded OS)
Rhapsody (an early form of Mac OS X)
RISC iX - Derived from BSD 4.3, by Acorn computers, for their ARM family of machines.
RISC/os (a port by MIPS of 4.3BSD to the RISC MIPS architecture)
RMX
SCO UNIX (from SCO, bought by Caldera who renamed themselves SCO Group)
SINIX (a port by SNI of Unix to the RISC MIPS architecture)
Solaris (Sun's System V-based replacement for SunOS)
SunOS (BSD-based Unix system used on early Sun hardware)
SUPER-UX (a port of System V Release 4.2MP with features adopted from BSD and Linux for NEC SX architecture supercomputers)
System V (a release of AT&T Unix, 'SVR4' was the 4th minor release)
System V/AT, 386 (The first version of AT&T System V UNIX on the IBM 286 and 386 PCs, ported and sold by Microport)
Trusted Solaris (Solaris with kernel and other enhancements to support multilevel security)
UniFLEX (Unix-like OS from TSC for DMA-capable, extended addresses, Motorola 6809 based computers; e.g. SWTPC, GIMIX, …)
Unicos (the version of Unix designed for Cray Supercomputers, mainly geared to vector calculations)
Unison RTOS (Multicore RTOS with DSP Optimization)

Non-proprietary
Unix-like
Research Unix-like and other POSIX-compliant

Minix (study OS developed by Andrew S. Tanenbaum in the Netherlands)
Plan 9 (distributed OS developed at Bell Labs, based on original Unix design principles yet functionally different and going much further)
Inferno (distributed OS derived from Plan 9, originally from Bell Labs)
Plan B (distributed OS derived from Plan 9 and Off++ microkernel)
Unix (OS developed at Bell Labs ca 1970 initially by Ken Thompson)
Xinu (Study OS developed by Douglas E. Comer in the USA)

Free and open source Unix-like
Ubuntu, an example of a Unix-like system

BSD (Berkeley Software Distribution, a variant of Unix for DEC VAX hardware)
FreeBSD (one of the outgrowths of UC Regents' abandonment of CSRG's 'BSD Unix')
DragonFlyBSD forked from FreeBSD 4.8
Darwin
NetBSD (one of the outgrowths of UC Regents' abandonment of CSRG's 'BSD Unix')
OpenBSD forked from NetBSD
GNU
GNU/Linux (GNU Free/Open Source Operating System Software combined with the Linux kernel)

See also: List of Linux distributions

OpenSolaris, contains original Unix (SVR4) code. Now discontinued by Oracle in favor of Solaris 11 Express
OpenIndiana, aims to continue development and distribution of OpenSolaris operating system. Operates under the Illumos Foundation. Uses the Illumos kernel, which is a derivative of OS/Net, which is basically a Solaris/OpenSolaris kernel with the bulk of the drivers, core libraries, and basic utilities.
Nexenta OS, based on the OpenSolaris kernel with Ubuntu packages
Jaris OS, based on OpenSolaris with support for Japanese
RTEMS (Real-Time Executive for Multiprocessor Systems)
Syllable Desktop
VSTa
FMI/OS, successor of VSTa

Other Unix-like

TUNIS (University of Toronto)

Non-Unix-like
Research non-Unix-like

Amoeba (research OS by Andrew S. Tanenbaum)
Croquet
HelenOS research and experimental operating system
House Haskell User's Operating System and Environment, research OS written in Haskell and C.
ILIOS Research OS designed for routing
EROS microkernel, capability-based
CapROS microkernel EROS successor.
Coyotos microkernel EROS successor, goal: be first formally verified OS.
L4 Second generation microkernel
Mach (from OS kernel research at Carnegie Mellon University; see NeXTSTEP)
Nemesis Cambridge University research OS - detailed quality of service abilities.
Spring (research OS from Sun Microsystems)
V from Stanford, early 1980s[2]

Free and open source non-Unix-like

FreeDOS (open source DOS variant)
FreeVMS (open source VMS variant)
Haiku (open source inspired by BeOS, under development)
MonaOS (written in C++)
ReactOS (Windows NT-compatible OS; currently in early, but active development phase)
OZONE (object-oriented)
Cosmos (written in C#)

Disk Operating Systems
Main article: DOS

86-DOS (developed at Seattle Computer Products by Tim Paterson for the new Intel 808x CPUs; licensed to Microsoft, became PC DOS/MS-DOS. Also known by its working title QDOS.)
PC DOS (IBM's DOS variant, developed jointly with Microsoft, versions 1.0–7.0, 2000, 7.10)
MS-DOS (Microsoft's DOS variant for OEM, developed jointly with IBM, versions 1.x–6.22 Microsoft's now abandoned DOS variant)
Concurrent CP/M-86 3.1 (BDOS 3.1) with PC-MODE (Digital Research's successor of CP/M-86 and MP/M-86)
Concurrent DOS 3.1-4.1 (BDOS 3.1-4.1)
Concurrent PC DOS 3.2 (BDOS 3.2) (Concurrent DOS variant for IBM compatible PCs)
DOS Plus 1.2 (BDOS 4.1), 2.1 (BDOS 5.0) (single-user, multi-tasking system derived from Concurrent DOS 4.1-5.0)
Concurrent DOS 8-16 (dual-processor variant of Concurrent DOS for 8086 and 8080 CPUs)
Concurrent DOS 286 1.x
FlexOS 1.00-2.34 (derivative of Concurrent DOS 286)
FlexOS 186 (variant of FlexOS for terminals)
FlexOS 286 (variant of FlexOS for hosts)
Siemens S5-DOS/MT (industrial control system based on FlexOS)
IBM 4680 OS (POS operating system based on FlexOS)
IBM 4690 OS (POS operating system based on FlexOS)
FlexOS 386 (later variant of FlexOS for hosts)
IBM 4690 OS (POS operating system based on FlexOS)
Concurrent DOS 386 1.0, 1.1, 2.0, 3.0 (BDOS 5.0-6.2)
Concurrent DOS 386/MGE (Concurrent DOS 386 variant with advanced graphics terminal capabilities)
Multiuser DOS 5.0, 5.01, 5.1 (BDOS 6.3-6.6) (successor of Concurrent DOS 386)
CCI Multiuser DOS 5.0-7.22 (up to BDOS 6.6)
Datapac Multiuser DOS
Datapac System Manager 7 (derivative of Datapac Multiuser DOS)
IMS Multiuser DOS 5.1, 7.0, 7.1 (BDOS 6.6-6.7)
IMS REAL/32 7.50, 7.51, 7.52, 7.53, 7.54, 7.6, 7.7, 7.8, 7.90, 7.91, 7.92, 7.93, 7.94, 7.95 (BDOS 6.8 and higher) (derivative of Multiuser DOS)
IMS REAL/NG (successor of REAL/32)
Concurrent DOS XM 5.0, 5.2, 6.0, 6.2 (BDOS 5.0-6.2) (real-mode variant of Concurrent DOS with EEMS support)
DR DOS 3.31, 3.32, 3.33, 3.34, 3.35, 5.0, 6.0 (BDOS 6.0-7.1) single-user, single-tasking native DOS derived from Concurrent DOS 6.0)
Novell PalmDOS 1.0 (BDOS 7.0)
Novell DR DOS "StarTrek"
Novell DOS 7 (single-user, multi-tasking system derived from DR DOS, BDOS 7.2)
Novell DOS 7 updates 1-10 (BDOS 7.2)
Caldera OpenDOS 7.01 (BDOS 7.2)
Enhanced DR-DOS 7.01.0x (BDOS 7.2)
Novell DOS 7 updates 11-15.2 (BDOS 7.2)
Caldera DR-DOS 7.02-7.03 (BDOS 7.3)
DR-DOS "WinBolt"
OEM DR-DOS 7.04-7.05 (BDOS 7.3)
OEM DR-DOS 7.06
OEM DR-DOS 7.07 (BDOS 7.4/7.7)
FreeDOS (open source DOS variant)
ProDOS (operating system for the Apple II series computers)
PTS-DOS (DOS variant by Russian company Phystechsoft)
RDOS by Leif Ekblad (not to be confused with Data General Corporation's "Real-time Disk Operating System" for Data General Nova and Data General Eclipse minicomputers).
TurboDOS (Software 2000, Inc.) for Z80 and Intel 8086 processor-based systems
Multi-tasking user interfaces and environments for DOS
DESQview+ QEMM 386 multi-tasking user interface for DOS
DESQView/X (X-windowing GUI for DOS)

Network Operating Systems
Main article: Network operating system

Cambridge Ring
CSIRONET by (CSIRO)
CTOS (Convergent Technologies, later acquired by Unisys)
Data ONTAP by NetApp
SAN-OS by Cisco (now NX-OS)
Enterprise OS by McDATA
ExtremeWare by Extreme Networks
ExtremeXOS by Extreme Networks
Fabric OS by Brocade
NetWare (networking OS by Novell)
NOS (developed by CDC for use in their Cyber line of supercomputers)
Novell Open Enterprise Server (Open Source networking OS by Novell. Can incorporate either SUSE Linux or Novell NetWare as its kernel).
Plan 9 (distributed OS developed at Bell Labs, based on Unix design principles but not functionally identical)
Inferno (distributed OS derived from Plan 9, originally from Bell Labs)
Plan B (distributed OS derived from Plan 9 and Off++ microkernel)
TurboDOS (Software 2000, Inc.)
JunOS by Juniper
Cisco IOS by Cisco Systems

Web operating systems
Main article: Web operating system

Chrome OS
G.ho.st
eyeOS
DesktopTwo
YouOS
Browser OS
Glide OS
iCloud
Joli OS

Generic/commodity and other

BLIS/COBOL
Bluebottle also known as AOS (a concurrent and active object update to the Oberon operating system)
BS1000 by Siemens AG
BS2000 by Siemens AG, now BS2000/OSD from Fujitsu-Siemens Computers (formerly Siemens Nixdorf Informationssysteme)
BS3000 by Siemens AG (functionally similar to OS-IV and MSP from Fujitsu)
FLEX9 (by TSC for Motorola 6809 based machines; successor to FLEX, which was for Motorola 6800 CPUs)
GEM (windowing GUI for CP/M, DOS, and Atari TOS)
GEOS (popular windowing GUI for PC, Commodore, Apple computers)
JavaOS
JNode JNode.org's OS written 99% in Java (native compiled), provides own JVM and JIT compiler. Based on GNU Classpath
JX Java operating system that focuses on a flexible and robust operating system architecture developed as an open source system by the University of Erlangen.
KERNAL (default OS on Commodore 64)
MERLIN for the Corvus Concept
MorphOS (Amiga compatible)
MSP by Fujitsu (successor to OS-IV), now MSP/EX,[3] also known as Extended System Architecture (EXA), for 31-bit mode
NetWare (networking OS by Novell)
Oberon (operating system) (developed at ETH-Zürich by Niklaus Wirth et al.) for the Ceres and Chameleon workstation projects.
OSD/XC by Fujitsu-Siemens (BS2000 ported to an emulation on a Sun SPARC platform)
OS-IV by Fujitsu (based on early versions of IBM's MVS)
Pick (often licensed and renamed)
PRIMOS by Prime Computer (sometimes spelled PR1MOS and PR1ME)
Sinclair QDOS (multitasking for the Sinclair QL computer)
SSB-DOS (by TSC for Smoke Signal Broadcasting; a variant of FLEX in most respects)
SymbOS (GUI based multitasking operating system for Z80 computers)
Symobi (GUI based modern micro-kernel OS for x86, ARM and PowerPC processors, developed by Miray Software; used and developed further at Technical University of Munich)
TripOS, 1978
TurboDOS (Software 2000, Inc.)
UCSD p-System (portable complete programming environment/operating system/virtual machine developed by a long running student project at UCSD; directed by Prof Kenneth Bowles; written in Pascal)
VOS by Stratus Technologies with strong influence from Multics
VOS by Hitachi for its IBM-compatible mainframes, based on IBM's MVS
VM2000 by Siemens AG
VisiOn (first GUI for early PC machines; not commercially successful)
VPS/VM (IBM based, main operating system at Boston University for over 10 years.)
Miraculix Russian OS, under unknown license.

For Elektronika BK

ANDOS
CSI-DOS
KMON
MK-DOS
NORD
BKUNIX

Hobby

AROS (AROS Research Operating System, formerly known as Amiga Research Operating System)
AtheOS (branched to become Syllable Desktop)
Syllable Desktop (a modern, independently originated OS; see AtheOS)
Dreckig OS (uses experimental "megalithic kernel" architecture and has a GUI)[4]
DSPnano RTOS
EROS (Extremely Reliable Operating System)
HelenOS, based on a preemptible microkernel design
KolibriOS (a fork of MenuetOS)
LSE/OS
MenuetOS (extremely compact OS with GUI, written entirely in FASM assembly language)
Unison RTOS

Embedded
Personal digital assistants (PDAs)

Symbian OS
iOS (a subset of Mac OS X)
Embedded Linux
Maemo based on Debian deployed on Nokia's Nokia 770, N800 and N810 Internet Tablets.
MeeGo merger of Moblin and Maemo
webOS from Palm, Inc.
OpenZaurus
Ångström distribution
Familiar Linux
Android
Inferno (distributed OS originally from Bell Labs)
PenPoint OS
PEN/GEOS on HP OmniGo 100 and 120
PVOS
Palm OS from Palm, Inc; now spun off as PalmSource
Windows CE, from Microsoft
Pocket PC from Microsoft, a variant of Windows CE.
Windows Mobile from Microsoft, a variant of Windows CE.
DIP DOS on Atari Portfolio
MS-DOS on Poqet PC, HP 95LX, HP 100LX, HP 200LX, HP 1000CX, HP OmniGo 700LX
Newton OS on Apple Newton Messagepad
Magic Cap
NetBSD
Plan 9 from Bell Labs

Digital media players

DSPnano RTOS
ipodlinux
RockBox
iOS (a subset of Mac OS X)
iriver clix OS

Smartphones and Mobile phones
Main article: Mobile operating system

BlackBerry OS
Embedded Linux
Access Linux Platform
Android
bada
Openmoko Linux
OPhone
MeeGo (from merger of Maemo & Moblin)
Mobilinux
MotoMagx
Qt Extended
LiMo Platform
webOS
PEN/GEOS, GEOS-SC, GEOS-SE
iOS (a subset of Mac OS X)
Palm OS
Symbian platform (successor to Symbian OS)
Windows Mobile (superseded by Windows Phone)

Routers

AlliedWare by Allied Telesis (aka Allied Telesyn)
AirOS by Ubiquiti Networks
CatOS by Cisco Systems
Cisco IOS (originally Internetwork Operating System) by Cisco Systems
DD-WRT by NewMedia-NET
Inferno (distributed OS originally from Bell Labs)
IOS-XR by Cisco Systems
IronWare by Foundry Networks
JunOS by Juniper Networks
RouterOS by Mikrotik
ScreenOS by Juniper Networks, originally from Netscreen
Timos by Alcatel-Lucent
Unison Operating System by RoweBots
FTOS by Force10 Networks
RTOS by Force10 Networks

Other embedded

Contiki
eCos
FreeBSD
uClinux
MINIX
NCOS
freeRTOS, openRTOS and safeRTOS
polyBSD (embedded NetBSD)
REX OS (microkernel OS; usually an embedded cell phone OS)
ROM-DOS
TinyOS
µTasker
ThreadX
DSPnano RTOS
Windows Embedded
Windows CE
Windows Embedded Standard
Windows Embedded Enterprise
Windows Embedded POSReady
Wombat OS (microkernel OS; usually a real time embedded OS)

Capability-based
LEGO Mindstorms

brickOS
leJOS

Other capability-based

Cambridge CAP computer operating system demonstrated the use of security capabilities, both in hardware and software, also a useful fileserver. Implemented in ALGOL 68C.
Flex machine - The hardware was custom and microprogrammable, with an operating system, (modular) compiler, editor, * garbage collector and filing system all written in ALGOL 68.
HYDRA - Running on the C.mmp computer at Carnegie Mellon University, implemented in the programming language BLISS.[5]
KeyKOS nanokernel
EROS microkernel
CapROS EROS successor
Coyotos EROS successor, goal: be first formally verified OS
V from Stanford, early 1980s[2]

Enjoy @niranjan