Darwin is the Open Source operating system from Apple that forms the basis for OS X, and PureDarwin is a community project to make Darwin more usable. See the Wiki for more information.
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Darwin is the Open Source operating system from Apple that forms the basis for Mac OS X, and PureDarwin is a community project to make Darwin more usable (some people think of it as the informal successor to OpenDarwin).

One current goal of this project is to provide a useful bootable ISO of Darwin 10.x and Darwin 9.x.

See the Wiki for more information.