http://netbsd.org http://freebsd.org http://openbsd.org http://dragonflybsd.org
They all borrow from each other. They even borrow from Apple sometimes.
As for what has been copied, you simply need to read the source code.
Instead, you're saying OSX, which is BSD-based, borrowed elements from...BSD-based projects?
Wow. What's next? Are you going to call out the Kubuntu team?
http://netbsd.org http://freebsd.org http://openbsd.org http://dragonflybsd.org
They all borrow from each other. They even borrow from Apple sometimes.
As for what has been copied, you simply need to read the source code.