Mac OS X
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Mac OS X is a propietary, Unix-based operating system developed by Apple Inc. Based on BSD-Unix with a graphical user interface and API based on the dead OPENSTEP operating system from NeXT, it has become the most used and probably most popular Unix in the world. Its open source core, named Darwin, is based on FreeBSD 5.0 and the Mach 3.0 microkernel.