Invented by OpenBSD
I've never understood why anyone wouldn't just use OpenBSD if you're going to use a BSD.  I'm sure there are reasons, there must be, but OpenBSD has a long history of having really great source code that's useful just about everywhere (hint: you're using OpenSSH almost assuredly on every linux box ever, and it's fantastic).  To me, as a developer I get the whole NIH thing.  I really do.  I just don't get why you'd choose "here" to be somewhere that doesn't include all the amenities in the first place.