BIND - BIND is by far the most widely used DNS software on the Internet.

PowerDNS - PowerDNS offers open source DNS software, services, and support.

Unbound - Unbound is a validating, recursive, and caching DNS resolver.

dnsmasq - Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server.

djbdns - The djbdns software package is a collection of Domain Name System tools created by Daniel J.

NSD - NSD is an authoritative only, high performance, simple and open source name server.