No-IP - Dynamic DNS and Managed DNS Provider
DirectUpdate - DirectUpdate is a dynamic DNS updater with many features.
Duiadns - free dynamic dns, enhanced ipv6 features, apple routers mDNS support.
Duck DNS - Free dynamic DNS hosted on Amazon VPC
DNS-O-Matic - DNS-O-Matic (dnsomatic.
Dynamic DNS client for Windows - It’s essentially a PAR‘ed up version of a slightly modified ddclient, packaged as a Windows service...