JBoss ESB

If SOA is too expensive, complex or politically challenging, the technology won’t take off. How, then, is it possible to build an SOA that overcomes political and cost constraints? Driving an SOA strategy to success in a large organization requires a corporate-level CIO with the power to drive a vision, enforce a set of architectural goals and blueprints, and mediate financial allocations. To get a manageable SOA, you’ll need to start with SOA platforms that represent a relatively low investment. That’ll likely mean tools and platforms that are open source, with support and ecosystem benefits available at a low cost.

JBoss team have designed their own Service Bus: JBoss Enterprise Service Bus  is a robust SOA solution designed since the release 4.2 with build-in fail-over, load balancing and delayed message redelivery. JBossESB allows you to distribute service instances across many nodes. Each node can be a virtual or physical machine running one or more instances of JBossESB.