DNSUpdate is a client for DynDNS.org specific to MacOS X. It uses the Cocoa framework and is launched at boot time. It comes with a graphic application to configure and monitor the client.
What's new in this version:
The daemon state is now kept across reboot. You can change this behavior with the DNSUpdate preferences: Keep state across reboot, Activated/Desactivated on boot or auto-start (the daemon is activated only if the application is launched)