You don't know what you're talking about. OS X 10.anything is an amalgamation of a Mach microkernel, a BSD kernel & userland utilties running atop the Mach Microkernel, and the Aqua user interface above that. Darwin, the operating system part that encompasses the Mach microkernel, the BSD kernel and userland, and the device drivers, is an open source operating system, you can still see Darwin code drops from Apple.
The BSD parts of Darwin borrowed heavily from both NetBSD and FreeBSD initially, and exchanges between Apple and FreeBSD in particular have remained constant.
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