Duck DNS - Free dynamic DNS hosted on Amazon VPC
Dns Jumper - DNS Jumper is a portable freeware App which makes changing your DNS settings as easy as clicking a button , it is the world's first IPv6 supported Dns tool
FreeDNS by Afraid.org - Free DNS hosting, lets you fully manage your own domain. Dynamic DNS and Static DNS services available. You may also create hosts off other domains that we host upon the domain owners consent, we have several domains to choose from!
namebench - Provides personalized DNS server recommendations based on your browsing history.