#3 Linux (GNU/Linux)  

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; its underlying source code is available for anyone to use, modify, and redistribute freely.

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FXEF FXEF: 81 points   3 years ago
The Linux kernel has done more for open source than any one project.
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somethingaboutpie somethingaboutpie: 44 points   2 years ago
The penguin, the legend
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