Banshee – web services client framework
Banshee is a project I have been developing as an effort to ease web services clients development. It is compatible with SOAP (1.1 and 1.2) versions, as well as REST services, too. The initial version will ship with some features like easy handling of secure web services (with https, certificates, using WS-Security or HTTP authentication), as well as dynamically changing addresses of services, etc.
Also, Banshee´s focus is to ease client´s model development, as it may be able to convert regular Java Objects to XML, or it can send XML Strings to services. The conversion to and from XML is made through converters, which can be easily customized (the default engine is JAXB, but the intent is, in the future, to ship with converters for XStream and XMLBeans, too).
Check it out in http://www.bansheeframework.com/.