As I understand it, the kernel is pretty much a hybrid of Mach and FreeBSD, and I don't think you can really say that it's more of one than the other: http://en

As I understand it, the kernel is pretty much a hybrid of Mach and FreeBSD, and I don't think you can really say that it's more of one than the other: http://en.wikipedia.org/wiki/XNU http://en.wikipedia.org/wiki/XNU There's definitely more BSD in there than just the userland.