OpenMAMA - Open Middleware Agnostic Messaging API

OpenMAMA Project provides a vendor neutral integration layer for a variety of message oriented middleware systems and messaging protocols. It enables an application to employ a range or middleware systems simultaneously or switch between them at will while developing with a single open source API. Adding or changing the messaging stack does not require lengthy and expensive code changes.
In addition to providing a single API for messaging, OpenMAMA implements a number of advanced features that simplify writing many messaging applications including those that consume financial market data.