http://www.bashiro.com/soft/Products/Download/Other_Os/other_os.html
This is a Java client for DynDNS.org, which requires Java 1.4.2. There's also a version for other dynamic DNS providers.
http://www.bashiro.com/soft/Products/Download/Jip_General/jip_general.html
Source: OS/2 Warp News and Rumors