As you are all probably aware of (I hope), I maintain an open-source port of the XNU (iPhone OS/Mac OS X) kernel to ARMv7-A (soon AArch64 and ARMv6/v5!) platforms. The kernel is very bare in its implementation and needs a lot of work. Work seems to also not be put into the proper areas, so I made this article to rectify that issue. Simple enough, I hope.
Very interesting (via @stroughtonsmith).
XNU, an acronym for “X is Not Unix” (according to Wikipedia).
Also, the kernel behind MacOS X, which is registered by the OpenGroup as conforming to the UNIX 03 specification, making it Unix (and capable of using Unix-related copyrights in advertising).