POJ - Mule 1.1 open-source ESB

What is Mule?
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Mule ESB (Enterprise Service Bus) and messaging platform. It is a highly-distributable, SEDA-based object broker that can seamlessly handle interactions with other applications using disparate transport and messaging technologies.

For more info: http://mule.codehaus.org/Introduction

Whats new in Mule 1.1
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* JBI Integration. Mule can run in any JBI container.
* BPEL Support. Yuo can perform service orchestration with BPEL and other mule cvomponents and routers.
* Saop can now be served over any Mule transport just be specifying the protocol in the serviceUri
* Improved support for .Net service invocations
* Event sheduling has been introduced.
* EJBs can now be managed by Mule and invoked as part of an event flow.
* RMI objects can be managed by Mule and invoked.
* FTP transport support
* Support for MIME attachements
* Many more smaller features and bug fixes.

http://mule.codehaus.org/