SheerDNS is extremely light-weight, simple, and fast, and written with security in mind.

SheerDNS was written to be a simple replacement master DNS server, that can be used where atomic updates are required. Because it stores each record in a small file, updating records does not require the sheerdns process to be notified or restarted. Each update is immediately available and served as-is.

SheerDNS would be an ideal candidate for creating an RBL to block SPAM for your mail, or web site(s). It would also be a good candidate for providing DNS on embeded systems. As it's small, and requires few resources. Naturally, it's also a good candidate for any situation that needs Primary / Authoritative DNS.

FreeBSD:

Using the ports system:

cd /usr/ports/dns/sheerdns make install clean

pkg install dns/sheerdns