tinydyndns is a simple but powerful dynamic DNS solution that uses djbdns. It cooperates with the djbdns package to publish dynamic IP addresses authenticated through POP connections. On successfully authenticated POP connections, the tinydyndns-update program manipulates tinydns' constant database "data.cdb" directly without rebuilding it; this makes the dynamic DNS solution use very few system resources. Using a POP service for authentication saves the work for installing special client software, since POP clients are available for every common network-aware operating system. To provide the DNS and POP service, tinydyndns cooperates with djbdns, qmail, and cvm.
dnstop is a libpcap application (ala tcpdump) that displays various tables of DNS traffic on your network. It currently displays tables of source IP addresses, destination IP addresses, query types, response codes, opcodes, top level domains, second level domains, third level domains, etc.
xbaydns provides a Web management interface for BIND 9. Its user-friendly Web interface is based on the Django framework. It has been tested on many OSes, including FreeBSD, Linux, and MacOS X Leopard. It provides an easy-to-use Web interface for DNS record management while implementing most of the advanced features provided by BIND.
slapi-dnsnotify is a plugin for OpenLDAP or other LDAP servers. It watches for changes in the serial number of a DNS zone stored in the LDAP server, and notifies DNS slave servers to refresh their copy of the zone. It can also increment the serial number of a zone whenever changes in that zone are made.