--WINDOWS SERVERS ISC BIND - Download BIND is the most popular DNS server software out there. It is free and open source. Its strong point is an excellent implementation of DNS standards. This makes it highly interoperable with other dns servers and provides features not found in any other dns server. Unfortunately, it has a notorious past of being insecure - so make sure you always have the latest version and learn how to secure it. Easy to manage once you get the hang of things, this server has a high learning curve.