I was familiar with tcpmon from Apache Axis distribution. But I had no idea that there was a independent Apache TCPMon. The primary difference between the two seems to be the built in sender screen that allows you to enter a SOAP request, submit the request to a web service, and view the response.

If you work with web services in Java, then it is definitely worth the download. The screen shot below shows the same web service request and response used in my Java Web Services Message Client – the request on top and the response below.