DynDNS Simply Client - Small standalone dyndns client
DirectUpdate - DirectUpdate is a dynamic DNS updater with many features.
No-IP - Dynamic DNS and Managed DNS Provider
Dynamic DNS client for Windows - It’s essentially a PAR‘ed up version of a slightly modified ddclient, packaged as a Windows service...
Dyn - Managed DNS, Outsourced DNS & Anycast DNS
Marcs Updater - Your router doesn't support DynDNS, OpenDNS or DNS-O-Matic by default or is limited in number...