At the moment the project is not ready for production use. A lot of functionality is still missing (authentication, encryption), bugs have to be resolved and documentation has to be written. What we do have is a working server for FreeBSD 4.x and clients for BSD, Linux, HP-UX and Solaris. If you are interested you can download the sources here.
You can also have a look at an implementation of the DDNS Daemon and try it for yourself here
If you have any Questions or Remarks please send them to me.