TrustedReviews has posted a review of Apple Mac OS X v10.4 - Tiger today

"The base of OSX is BSD, an operating system designed at Berkley University (Hence Berkley Software Distribution). On top of BSD is a set of technologies created by Apple and named ‘Darwin’, due to the evolution of the OS that these technologies enabled. BSD is very similar to UNIX, the back-end, geek-only operating system that also forms the basis for the mainstream (at least by comparison) Linux."

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