Web Services Tool Kit for Mobile Devices provides tools and run-time environments that allow development of applications that use Web Services on small mobile devices, gateway devices, and intelligent controllers. This tool kit's JavaTM Web service run-time environment is supported devices that support the J2ME, WCE, and SMF environments. The C Web service run-time environment is supported on the Palm and Symbian.
Update: Version 3.0.0: An implementation of Web Services Security for mobile devices. A preview implementation of a J2ME Mobile SOAP server with a demo viewer running on mobile devices.