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- Authored at Bell Labs by Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna
- Written in Assembly
- Given freely to whoever asked for it
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- Unix rewritten in C by Ritchie
- Made it easier to port to different platforms
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- Occurred when AT&T was no longer required not to enter business with computer products
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- Founded by Richard Stallman
- Aimed to create a free Unix-compatible software system
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- Torvalds' introduction to Unix
- Frustrated by lack of usable free and open source operating systems
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- Torvalds initially named his project Freax
- Later renamed to Linux
- Intended only for use with specific hardware, not expected to be ported
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- X Window allowed the creation of a graphical user interface (GUI)
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- Used GNU tools to implement various tools, like shells, compilers, etc.
- Released under the GNU General Public License
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- The very recognizable "Tux" penguin logo is adopted as an official mascot
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- The first "advanced desktop environment" released for Linux
- Was controversial due to use of proprietary Qt-Toolkit
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- Many companies, such as Oracle and IBM, announce support for Linux
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- Free and open-source competitor to KDE released for Linux
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- Ubuntu is a very popular Linux distribution
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- Sponsored by Google
- Mobile operating system based on modified Linux kernel