Well, I only have three drivers, and only the Modbus driver is very "pure" from an OPC viewpoint. And its most important feature is exposing data to external Modbus clients. Not really something that makes sense for a stand-alone OPC server. This image streamer driver is only incidentally an OPC driver--its core functionality depends on the platform's web technology. Java's not really a first choice for stand-alone video stream conversion servers...