OxygenXML is a full featured XML Integrated Development Environment for working with a wide variety of XML related technologies.   It includes a set of programs for working with and testing WSDL files.   The WSDL Analyzer allows you to use an existing WSDL as a client application, and test against a Server instance.   The basic soap envelope and payloads are generated, and available for editing.  The corresponding results received back from the service are available for editing and viewing later.   OxygenXML is a commercial application, but is available for a 30 day trial.