djb as in Daniel J. Bernstein? He has a limited set of software that he has written, you are not going to replace many FreeBSD "utilities" with his software. I am not confident that you understand what you're asking.
I use his software regularly and greatly appreciate his approach to secure software development. However, his lack of consideration of standard UNIX conventions such as the Filesystem Hierarchy can be frustrating. Last I heard, Theo removed djb's software from OpenBSD ports due to his licensing and conflict over the filesystem hierarchy.
You could replace your MTA with QMAIL.
You could replace your DNS with djbdns.
You could run a static content Web server with Publicfile.
You could run a combination of tcpserver and daemontools instead of a more common superserver like *inetd. daemontools is very useful to keep software running in case of crashing, but you have to run in the foreground.