The Linux operating system
Linux is a relatively modern operating system created in 1991 by Linus Torvalds, a Finnish computer science student at the time, from Helsinki. Originally released as a free and open source platform prohibiting commercial redistribution, Linux eventually adopted the GNU General Public Licensing (GPL) model in 1992. This move played a significant role in its wide adoption by the developer community and commercial enterprises alike.
Initially made for Intel x86 processor-based computer architectures, Linux has since been ported to a wide variety of platforms, becoming one of the most popular operating systems currently in use.
The genesis of Linux might be considered the open source alternative of its mighty predecessor, Unix. This system was a commercial-grade operating system developed at AT&T Bell Labs research center by Ken Thompson and Dennis Ritchie in 1969.