One OS

 One Operating System

• Arthur                                                 
• AmigaOS
  • AmigaOS 1.0-3.9 (Motorola 68000)
  • AmigaOS 4 (PowerPC)
• Amiga Unix (aka Amix)
• Apple DOS
• Apple Pascal
• ProDOS
• GS/OS
• ARX
• BESYS
• Plan 9 from Bell Labs
• MOS
• RISC iX
• Atari DOS (for 8-bit computers)
• Atari TOS
• Atari MultiTOS
• RISC OS
• Mac OS
• A/UX (UNIX System V with BSD extensions)
• Rhapsody
• NeXTSTEP
• OS X (formerly Mac OS X)
• OS X Server (formerly Mac OS X Server)
• Windows 10
• Linux

All of the above are operating systems from different firms. It is a small part of a very big list from Wikipedia.
There are multiple Os from same firms.One for mobile, and then second for  PC and some are designed to work with Interned, they are tuned to work with the internet.
The most famous three are Windows , Mac and Linux. Windows being the most widely used among the three.

Windows Vista, XP, 7,8,8.1 and 10 are most famous because of their user friendliness  . From Win 8 and above metro styled Apps have been introduced, the tiles based interface. It looks beautiful and fluid.Windows have now their own app store.Windows 10 is the latest. Windows Os are as follows.

1985 Windows 1.0 1987 Windows 2.0 1988 Windows 2.1 1990 Windows 3.0 1992 Windows 3.1 1992 Windows for Workgroups 3.1 1993 Windows for Workgroups 3.11 1995 Windows 95 / DOS 7.0 - FAT 16 1997 Windows 95 OSR2 / DOS 7.1 - FAT 32 1998 Windows 98 1999 Windows 98 SE (Second Edition) 2000 Windows Me (Millennium Edition) 1993 Windows NT 3.1 1994 Windows NT 3.5 1995 Windows NT 3.51 1996 Windows NT 4.0 2000 Windows 2000 (NT 5.0) 2001 Windows XP (NT 5.1) 2002 Windows Server 2002 (NT 5.1) 2003 Windows Server 2003 (NT 5.2) 2007 Windows Home Server (NT 5.2) 2007 Windows Vista (NT 6.0) 2008 Windows Server 2008 (NT 6.0) 2009 Windows Server 2008 R2 (NT 6.1) 2009 Windows 7 (NT 6.1) 2011 Windows Home Server 2011 (NT 6.1) 2012 Windows Server 2012 (ReFS 6.2) 2012 Windows 8 (ReFS 6.2) 2013 Windows 8.1 (ReFS 6.2) 2014 Windows 10 (ReFS 6.4)

Mac Os is from Apple. Apple is known for its ultra beautiful interface. The design is most extraordinary. They have wider reach. They make products comprising a big area. They make phones, tablet, home pc, apple TV and many more. Apple puts class in its devices which your money can buy.

Mac has the following versions 

• 5.1Public Beta: "Kodiak"
• 5.2Version 10.0: "Cheetah"
• 5.3Version 10.1: "Puma"
• 5.4Version 10.2: "Jaguar"
• 5.5Version 10.3: "Panther"
• 5.6Version 10.4: "Tiger"
• 5.7Version 10.5: "Leopard"
• 5.8Version 10.6: "Snow Leopard"
• 5.9Version 10.7: "Lion"
• 5.10Version 10.8: "Mountain Lion"
• 5.11Version 10.9: "Mavericks"
• 5.12Version 10.10: "Yosemite"
• 5.13Version 10.11: "El Capitan"

Linux is an open source operating system with POSIX compliant capability. It stands for portable operating system interface which in itself is quite understandable.  Linux kernel, is first developed by Linus Torvalds.The following are the most popular Linux distributions or Os.

Linux Mint

Ubuntu 

Debian 

Mageia 

Fedora 

openSUSE 

PCLinuxOS 

Manjaro 

Arch 

Puppy

All these are beautiful Os from different firms. But lets look from the passion point of view not competition. Lets look at the roots of all these three most popular OS. Lets look from which software developing language has been used to develop all these three different types OS, namely, Windows, Linux and Mac.

Windows as according MSDN forum uses C, C++ and C# and

 some assembly level code to develop their operating systems.

No doubt C is the most reliable and unfriendly in terms of OS

development. 

Talking about Mac os, it has a Linux based kernel which is 

developed in C, some of its part is developed in Objctive C which 

is  C language with object oriented programming concepts.

And the third which is Linux is generally C and some C++

Therefor, my friends, if we look at the roots of the Os, majority of therm are developed using single language. Their sour is same but they are driven because of the competition in the market. When a product starts to compete then it does not remain for its user or buyer, it reflects the drawbacks of other competitors. Therefor, it is not for us but for the competitors. We can replace competition with passion.

Once, all the competition in the market becomes passion ,then all the different competitors will come and join hands and develop a super One Operating System or otherwise they are doing the same thing as because they are using the same soul or C based Kernel, it would not make any difference at ground zero but will turn the thought process, which is the most important thing, one can ever imagine, once selfish thoughts take a spiritual turn they tend to transform form and create wonders for each and every soul living in this universe. After all, we all are dependent on each other

Thank and keep hardworking!!

Ashumeet Mitter