OperatingSystems

Operating systems are the core component of a computer. The OS sits between the hardware and the user and user's programs.

AmigaDOS - Commodore Amiga OS
Android - Google's popular Linux-based OS for handhelds and tablets
BSD - Berkeley Standard Distribution version of Unix from the University of California at Berkeley
Chromium OS - Google's emerging Linux based open source OS for desktops, laptops, and netbooks
CP-M - Control Program for Microcomputers from Digital Research
FreeBSD - Open source fork of the Berkeley Standard Distribution
Gnu Hurd - The Gnu project's open source OS kernel
iOS - Apple's OS/X based OS for the iPhone, iTouch, and iPad
Linux - Linus Torvald's popular open source Unix look-alike
MPE - Hewlett-Packard's OS for the HP-3000 minicomputer
MS-DOS - Microsoft DOS for early PCs
OS-X - Apple's BSD based OS for the Macintosh
NetBSD - Free, BSD-based UNIX operating system.
OpenBSD - Free BSD based secure operating system
OpenVMS - Digital Equipment Corporation's OS for the 32 bit VAX mini-computer and 64 bit Alpha architecture
PalmOS - Operating system on Palm handhelds and compatibles
Plan 9 - AT&T research OS intended as follow on for Unix
RiscOS - Acorn Computers OS for ARM based computers
Smalltalk - Xerox PARC operating environment and language
Symbian - Nokia's OS for smartphones
UCSD P-system - University of California at San Diego OS, implementing a virtual machine and programmed in Pascal
Unix - AT&T operating system from Bell Labs
WebOS - Hewlett-Packard's (formerly Palm's) Linux based OS for handhelds and tablets
Windows - Microsoft Windows
zOS - IBM mainframe operating system