Web Services Interoperability Technology (WSIT) is an open source implementation of many of the web services specifications (commonly referred to as WS-*). The project was started by Sun Microsystems, and consists of Java API that allow developers to create web service clients and services that enables operations between the Java platform and clients and servers developed with the WS-* specifications. WSIT provides implementation of the following specifications for interoperability with .NET 3.0.
WS-Reliable Messaging Policy
WS-Security 1.0 and 1.1
Web service specifications are referred to collectively as WS-* although there is neither a single managed set of specifications that this consistently refers to nor one recognized body that owns all the specifications. WS-* is a general nod to the fact that many specifications use WS as their prefix.
Sun is working closely with Microsoft to ensure interoperability of web services enterprise technologies such as message optimization, reliable messaging, and security. The initial release of the Web Services Interoperability Technologies (WSIT) is a product of this joint effort. WSIT is an implementation of a number of open web services specifications to support enterprise features such as message optimization, reliable messaging, security, bootstrapping and configuration. More information can be found in this WSIT tutorial on java.sun.com.