Operating systems

1. Microsoft Windows -popular, versatile OS suitable for businesses

1.1. Early versions

1.1.1. Windows 1.0

1.1.2. Windows 2.0

1.1.3. Windows 2.1x

1.2. Windows 3.x

1.2.1. Windows 3.0

1.2.2. Windows 3.1x

1.3. Windows 9x

1.4. Windows NT

1.5. Windows Vista

1.6. Windows 7, 8, 8.1, 10

2. OS X -OS for Macintosh computers

2.1. Public Beta: "Kodiak"

2.2. Version 10.0 - 10.8 : "Cheetah", "Puma", "Jaguar", "Tiger","Leopard","Snow Leopard", "Lion", "Mountain Lion"

2.3. Version 10.9: "Mavericks"

2.4. Version 10.10: "Yosemite"

2.5. Version 10.11: "El Capitan"

3. Steam OS -Operating system for Steam Machine game consoles

3.1. Intel or AMD 64-bit capable processor

3.2. 4 GB (or more) RAM

3.3. 500 GB or larger hard disk

3.4. NVIDIA (post-Fermi graphics cards), Intel, or AMD graphics card (Radeon 8500 or newer)

3.5. USB port for installation

3.6. UEFI boot support

4. Linux - free and open-source OS

4.1. operating system for personal computors

4.2. Linux distribution

4.2.1. Debian

4.2.2. Ubunutu

4.2.3. Linux Mint

4.2.4. Fedora

4.2.5. Gento

4.3. operating systems for smartphones based on Linux

4.3.1. Android

4.3.1.1. Jelly Bean

4.3.1.2. Kitkat

4.3.1.3. Lollipop

4.3.1.4. Marshmallow

4.3.2. Firefox Os

4.3.3. Mer

4.3.4. Tizen

5. BlackBerry -mobile operating system

5.1. BlackBerry OS 1.0, 3.6, 5.0, 6.0, 7.0

5.2. BlackBerry 10

5.2.1. Z30, Z10, Z3, Q10, Q5

6. iOS

6.1. software versions

6.1.1. iPhone OS 1,2,3

6.1.2. iOS 4, 5, 6, 7, 8, 9

6.2. platforms

6.2.1. iPhone

6.2.2. iPad

6.2.3. iPod touch