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!
No-IP - Dynamic DNS and Managed DNS Provider
XName - Free DNS hosting.
DNS-O-Matic - DNS-O-Matic (dnsomatic.
Duiadns - free dynamic dns, enhanced ipv6 features, apple routers mDNS support.
Duck DNS - Free dynamic DNS hosted on Amazon VPC