LINUX
Perhaps the most well known Open-source Software is Linux Operating System , derived from Unix.
Linux is the world fastest growing Client and Server Operating System.
Applications for Linux are rapidly growing . Many of these Applications are embedded in Cell phones , PDAs and other Handheld devices.
Although Linux is currently a small but rapidly growing presence on the Desktop environment , it plays a major role in the Back-office running Web Server and Local Area Networks (LAN).
IBM, Dell, HP , Intel and Sun have made Linux a central part of their offering to corporations.