The OS X userland and some other parts are derived from FreeBSD. One of the project initiators (Jordan Hubbard[1]) went to Apple and ported it for the initial v

The OS X userland and some other parts are derived from FreeBSD. One of the project initiators (Jordan Hubbard[1]) went to Apple and ported it for the initial version of OS X. He now left. https://wiki.freebsd.org/Myths#FreeBSD_is_Just_OS_X_Without_the_Good_Bits https://wiki.freebsd.org/Myths#FreeBSD_is_Just_OS_X_Without_... > The two operating systems do share a lot of code, for example most userland utilities and the C library on OS X are derived from FreeBSD versions. https://developer.apple.com/library/mac/documentation/Darwin/Conceptual/KernelProgramming/BSD/BSD.html https://developer.apple.com/library/mac/documentation/Darwin... > The BSD portion of the OS X kernel is derived primarily from FreeBSD, a version of 4.4BSD that offers advanced networking, performance, security, and compatibility features. [1]: http://en.wikipedia.org/wiki/Jordan_Hubbard http://en.wikipedia.org/wiki/Jordan_Hubbard