PureDarwin 
PureDarwin moved from https://code.google.com/p/puredarwin/
Darwin is the Open Source operating system from Apple that forms the basis for Mac OS X and PureDarwin. PureDarwin is a community project that aims 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/VM of Darwin 10.x
Come Join our forum over at https://www.pd-devs.org/
See the Wiki for more information.