Mac OS X
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Macintosh OS X is the current production operating system found on Apple Macintosh computers.
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Technical Details
Kernel
Mac OS X uses the "Mach" microkernel, which apparently is similar to the kernel used by FreeBSD.
Userland
In my experience, Mac OS X userland is a lot more like FreeBSD than Linux, but it definitely is still different than FreeBSD and has a significant amount of osx-specific stuff in it.
Filesystems
Mac OS X uses the HFS+ filesystem. Its not my favorite (ext3), but it works well for Apple's purposes. I've read that ZFS is usable on OS X, but I haven't tried it. It can also use regular HFS and UFS. I tried UFS a few years back but it didn't work well for me.
I think it can also partially mount Windows partitions.
Mac OS X Software