Based on BSD UNIX®

FreeBSD is an advanced operating system for x86 compatible (including Pentium®, Athlon™ and PC-98), amd64 compatible (including Opteron™, Athlon 64, and EM64T), UltraSPARC®, IA-64 and ARM architectures. It is derived from BSD, the version of UNIX® developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.

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