[ninjin]

Yes, and it is in fact the NetBSD Bluetooth stack [1] that OpenBSD had ported from the 4.2 release until it was ripped out in 5.6 [2]. Not to mention that the NetBSD Bluetooth stack is based on code from FreeBSD.

[1]: https://man.netbsd.org/NetBSD-11.x-BRANCH/bluetooth.3

[2]: https://man.openbsd.org/OpenBSD-5.5/bluetooth.4

There is a lot of sharing going on between the BSDs. Most commonly drivers being handed back and forth.