The Nintendo Switch OS might be a new iteration of the 3DS OS, and/or might be reusing some components of the FreeBSD Kernel

Hacker Marcan (who, for someone who says he does not intend to hack the Switch, has already looked a lot into its internals has stated that the Switch OS might be based on FreeBSD, due to some of the licensing text on the Switch mentioning FreeBSD.

If the Switch was based on FreeBSD, it would be the second console this generation to use FreeBSD, after the PS4. The benefits, from a hacking standpoint, would be that hacks for one of the devices would be likely to be adapted for the other one.

http://wololo.net/2017/03/09/hackers...do-switch-far/