Apple has posted Darwinv9.0 the source code on which OS X Leopard was developed.
Darwin is a Unix-like computer operating system released by Apple Inc. in 2000. Darwin is composed of code developed by Apple along with code derived from NEXTSTEP, as well as from FreeBSD and other free software projects.
Darwin forms the core set of components upon which Mac OS X was developed. It can also be run as a standalone operating system.
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