GDS GratisDNS DDNS Service is a service to use with Dynamic IP address and GratisDNS DDNS service. It sends your current ip address to GratisDNS every n interval. The service comes with a GUI for configuration.
You can configure 10 different domains/hosts and enable disable each separately.
This product is open source, and you may download the source code as well (below the application download). Its writen in Visual Studio 2010 (C#) .NET 4.0