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Enterprise Service Bus
Mule
Mule is a light-weight messaging framework. It is a highly distributable object broker that can seamlessly handle interactions with other applications using disparate technologies, transports and protocols.
The Mule framework provides a highly scalable environment in which you can deploy your business components. Mule manages all the interactions between components transparently whether they exist in the same VM or over the internet and regardless of the underlying transport used.
Celtix
Celtix delivers a Java enterprise service bus (ESB) runtime and set of extensibility APIs, simplifying the construction, integration and flexible reuse of technical and business components using a standards-based, service-oriented architecture.
ServiceMix
ServiceMix is an open source Enterprise Service Bus (ESB) and SOA toolkit built from the ground up on the semantics and APIs of the Java Business Integration (JBI) specification JSR 208 and released under the Apache license.
PeTALS
PEtALS is the highly distributed Open Source ESB hosted by OW2. PEtALS delivers OW2 JavaTM Business Integration (JBI) platform.
PEtALS provides a lightweight and packaged ESB based on JSR-208 specifications, with a strong focus on distribution and clustering.
PETaLS is the ESB sponsored by the OW2 Foundation.
JBossESB
JBossESB is offering Business Process Monitoring, Integrated Development Environment, Human Workflow User Interface, Business Process Management, Connectors, Transaction Manager, Security, Application Container, Messaging Service, Metadata Repository, Naming and Directory Service and Distributed Computing Architecture.