soapui 1.6 beta1 is now available adding support for attachments (MTOM, SwA), Code/WSDL Generation (JBossWS, JWSDP, XFire, Axis 1, Axis 2, .NET, GSoap, XmlBeans and JAXB), WS-I Basic Profile Validations, JUnit-style reports and much more!
read all about the new features: http://www.soapui.org/new_and_noteworthy_16.html
soapui is a desktop application for inspecting, invoking, developing and functional/load/compliance testing of web services over HTTP. It is mainly aimed at developers/testers providing and/or consuming web services (java, .net, etc). Functional and Load-Testing can be done both interactively in soapui or within an automated build/integration process using the soapui command-line tools. soapui currently requires java 1.5 and is licensed under the LGPL license.