I know the OpenBSD team wrote a from-scratch replacement for `ntpd`—[OpenNTPD](http://www.openntpd.org/)—that is available via `pkgsrc`/`ports`. My question is more about the base system: Is OpenNTPD the default `ntpd` in the base system in NetBSD or FreeBSD? For that matter, what about Linux distros, some of which (Gentoo or Arch, for example) are more "BSDish"?