| This is an operating system. | 
| FreeBSD http://www.freebsd.org/ "FreeBSD is an advanced operating system for x86 compatible (including Pentium® and Athlon™), amd64 compatible (including Opteron™, Athlon 64, and EM64T), Alpha/AXP, IA-64, PC-98 and UltraSPARC® architectures. It is derived from BSD, the version of | 
| POSIX http://standards.ieee.org/catalog/olis/posix.html A standard for permitting interoperability of computer programs on various Unix-like operating systems. | 
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