SOAFaces provides a MuleClient like API called UniversalClient. For those not familiar, the MuleClient interface is a universal messaging client available from the Mule Project that can invoke services endpoints such as JMS, Web Services, SMTP, SFTP
Are you still working with integration products from one of the typical large integration vendors such as IBM and Tibco and looking for a more lightweight approach? Then these two articles on Mule [1] and Apache ServiceMix [2] can serve as an eye-opener to the potential of Open Source ESBs. If you are already familiar with Mule or Apache ServiceMix, these articles will provide some insight in the new features of the latest versions of these Open Source ESBs and show you how to approach the design of your integration solution.
Open-Source ESBs in Action is a comprehensive look at the leading Enterprise Service Bus open-source products and how they are applied in the enterprise.