"Apple has brought BSD back into the public eye by making it the foundation of its Darwin operating system, which is in turn the foundation of the OS X software platform. Apple is a strong believer in the orchestral model; Darwin distributions are skinny, reflecting Apple's willingness to make choices among dozens or hundreds of contenders in each functional category. Apple's selections become part of OS X. More than any commercial software platform, OS X is unified, consistent. And soon it will be Unix."