Project Metro develops and evolves the codebase for Web Services Interoperability Technologies (WSIT) that enable interoperability between the Java platform and Windows Communication Foundation (WCF) (aka Indigo).

Project Metro's WSIT tecnology is bundled inside GlassFish. It is also possible to download a more recent version of Metro and install into GlassFish or Tomcat.

Project Metro uses JAX-WS and JAXB as a foundation upon which WSIT provides web services features such as bootstrapping communication, optimizing communication, reliable messaging, atomic transactions, security and trust.