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FreeBSD
FreeBSD is a free and open-source software operating system. It is based on Unix, as opposed to merely being a clone, but is nowhere near as popular as Linux. It has a reputation of only being used by hipsters who consider Linux too mainstream. This, however, does not take into account Apple's OS X, which is a FreeBSD derivative, regularly synchronized with FreeBSD upstream, and which is the most popular desktop UNIX.