Linux (also known as GNU/Linux) is a Unix-like computer operating system. It is one of the most prominent examples of open source development and free software; unlike proprietary operating systems such as Windows or Mac OS, all of its underlying source code is available to the public for anyone to freely use, modify, and redistribute.
Initially, Linux was primarily developed and used by individual enthusiasts on personal computers. Since then, Linux has gained the support of major corporations such as IBM, Sun Microsystems, Hewlett-Packard, and Novell for use in servers and is gaining popularity in the desktop market. It is used in systems ranging from supercomputers to mobile phones. Proponents and analysts attribute its success to its security, reliability, low cost, and freedom from vendor lock-in.
Open Source
Open Source :: Operating Systems
Unix :: Operating Systems
Open Source :: Unix

Linux.com - A Linux portal and directory.
FreeOS - Provides articles, documentation, links to software, and news about Linux and other operating systems.
Meta Description: [ FreeOS.com is the resource center for all free
operating systems. Here you will find all the latest news regarding most
of the free and open source operating systems.
]
Linux International - Non-profit association of groups, corporations, and others that work toward promoting and helping direct the growth of the Linux operating system and community.
Linux was invented here - University of Helsinki - Department of Computer Science. Information about Linux and get the latest kernel versions and recent Linux kernel mailing list archives.
The Linux Counter - Get yourself and your computer counted among the Linux users.
What Is...Linux? - Definition of Linux and description of its history, relation to GNU and other UNIX systems, and links to related sites.
Meta Description: [ Linux is a Unix-like operating system that was designed to provide personal computer users a free or very low-cost operating system comparable to traditional and usually more expensive UNIX systems. ]
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