MatrikonOPC Sniffer is FREEWARE and can be distributed openly. It is fully functioning software that can be run without restrictions.
For integrators installing and configuring OPC, MatrikonOPC Sniffer is an objective investigator for
troubleshooting OPC client/server interoperability issues. MatrikonOPC Sniffer does away with finger-pointing when OPC servers and clients don't communicate properly. It seamlessly logs the activity between OPC servers and clients to isolate interoperability issues and help solve problems quickly and easily.