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Apple publishes the Darwin code for Leopard

Darwin 9.0 forms the backbone of the UNIX-based operating system and has been made available to developers in the open source community, just as it has been since Mac OS X 10, the first version of the operating system.

Darwin 9.0 is a fully UNIX-compliant operating system that is based on Mach 3.0 and FreeBSD 5. It includes over a hundred Open Source products, such as bash, tcsh, ksh and zsh, emacs, vim and nano.

Apple has released previous iterations of Darwin, including those used between each of the major versions of Mac OS X, as well as incremental updates.

Web: http://developer.apple.com/darwin/