Java Dynamic DNS Client. Platform independent. Runs as application or demon. Supports ZoneEdit, Enom, ChangeIP, DynDNS.org, dhis.org. Simple to handle. Management per JMX and Ajax web interface. Mail Notification. Free accessibility monitoring w. JXTA P2
Many web site use 3322.org's dynamic DNS service. Orignally, 3322.org provided two clients for both windows and *NIX. For OSX and other OS, you can use this client. If you like, you can embeded it in your own application.