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Official page with downloads of the various Darwin releases and developer tools.
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Programming in the Darwin kernel and information on the differences between Darwin and other BSDs.
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A helpful guide to getting and installing Darwin on an x86 system.
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The mascot of the Darwin OS.
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A paper written by Wilfredo Sánchez, the then Open Source Engineering Lead at Apple, about the use of open source in commercial software such as Mac OS X Server.
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A paper on the design issues Apple faced when they ported the Mac OS to a semantically different Unix base (Darwin).
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Unix software ported to Mac OS X, either as binaries, or from source.
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A Unix distribution which focuses on the porting of free software to Darwin and Mac OS X.
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A general overview of the project to bring XFree86 (X11 server) to Darwin and Mac OS X as well as pointers to download and mirror sites.