The Open3.org XSTP Server is an XML based messaging middleware engine developed in Java. The XSTP Server leverages the best of existing technologies to provide a robust, scalable, fast and feature-rich architecture for enterprise integration development.

The XSTP Server is the first open source middleware initiative to leverage the power of XML as the internal and external messaging medium. This allows for fast and straightforward integration of XML aware applications in the enterprise. Furthermore, the XSTP Server supports standard APIs such as Java Messaging Service (JMS) for integration with other clients.