Well, I know FreeBSD developers are trying integrate OpenZFS into FreeBSD. So we can say FreeBSD adopts new technologies.
But there are old ones like the shells in the base system are only sh, csh, and tcsh. I know FreeBSD can't adopt fish and bash because of GPL license. However, zsh and ksh...
I would like to share HOWTO in Ghost in the Shell series about efficient working in the UNIX shell environment.
Ghost in the Shell - Part 2