ShowDep is not supported anymore. If you are still interested, you may see tool description here or download ShowDep here.
Thanks for your interest! - framework for web-based development of HMI/EMI/MES/SCADA applications. Silverlight, Web Services, WCF. Supports OPC and database Data Source. LiveData, Alarming, Historical data. Developers can create data source providers for any kind of PLC (programmable logic controllers).