No-IP - Dynamic DNS and Managed DNS Provider
Duck DNS - Free dynamic DNS hosted on Amazon VPC
Duiadns - free dynamic dns, enhanced ipv6 features, apple routers mDNS support.
DNS-O-Matic - DNS-O-Matic (dnsomatic.
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!
iWantMyName - Register your own custom domain for web applications, email, blog or website such as Google Apps...