JAXBBuilder is an open source eclipse plugin for generating Java classes directly from XML schema, the generated classes can then marshall to/from XML via Castor or the XJC RI API. The plug-in includes a JAXB project wizard, JAXB builder and property pages for JAXB configuration. see JAXB Builder on youtube

 If you want to provide additional methods to generated JAXB sources take a look at JAXB Spice