Mac OS X is based on FreeBSD.
FreeBSD is a free Unix-like operating system descended from AT&T UNIX via the Berkeley Software Distribution (BSD). FreeBSD's development began in 1993. It is completely free of any UNIX-sourced code and has been for many years.
Mac OS X is based upon the Mach kernel.[11] Certain parts from FreeBSD's and NetBSD's implementation of Unix were incorporated in Nextstep, the core of Mac OS X. Nextstep was the object-oriented operating system developed by Steve Jobs' company NeXT after he left Apple in 1985.
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