The PowerDNS nameserver is a modern, advanced and high performance
authoritative-only nameserver. It is written from scratch and conforms
to all the relevant DNS standards documents. PowerDNS is open source.
The PowerDNS nameserver utilizes a flexible backend architecture that
can access DNS information from any data source. This includes file
formats, Bind zone files, relational databases or LDAP directories.
See the net/powerdns-* packages for additional backend modules.