The userland is freebsd.. i.e. the executables in /usr/bin, /bin, etc. I'm sure apple alters a few things. The part of OSX that differs is in the kernel. Roughly half the kernel is FreeBSD 5.0 and the other half is based on the Mach 3.0 kernel design.
The MacOS X userland originally and primarily derives from NEXTSTEP. The original PPC port of NEXTSTEP, called Rhapsody, included a bunch of changes from NetBSD and FreeBSD (in that order), and OS X has since followed changes made to FreeBSD more closely.
MacOS X is using a monolithic kernel which derives from between the CMU Mach project v2.0 and v2.5 circa 1990, which was Avie Tenavian's grad project at CMU. Apple is not using the Mach 3.0 microkernel, nor is it using "half of the FreeBSD 5 kernel".
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