It's definitely Minio. :)

This kind of worries me though, as Minio is written in Go:

https://github.com/golang/go/issues/15658

I've not seen issues with Go on FreeBSD yet personally though, so I'm hoping it's extremely rare. Or that it gets fixed by someone before I hit it. :D

Docs seem to indicate that it is: http://doc.freenas.org/11/services.html#s3