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Re:OS X 10.10 – Source Code by voltagex_ on Thursday October 30, 2014 @09:39PM (#8536877)
From memory, this is the first release of the Darwin source in ages, but https://opensource.apple.com/ looks to have been updated.

http://www.puredarwin.org/ looks abandoned, and OpenDarwin disappeared long ago - http://www.applematters.com/article/opendarwin-dies-a-lonely...

Re:OS X 10.10 – Source Code by NSCFType on Friday October 31, 2014 @12:25AM (#8537309)
> From memory, this is the first release of the Darwin source in ages

Ages? https://opensource.apple.com/ looks like it has for a while, except for the addition of 10.10 (I grab CFLite, libclosure, libdispatch, and objc4 whenever they're made available after a release).