Open Source Enterprise Service Bus in Java

Apache Synapse is a easy-to-use and lightweight ESB which offers a wide range of management, routing and transformation capabilities. With support for HTTP, SOAP, SMTP, JMS, FTP and file system transports. Included is first class support for standards such as WS-Addressing, Web Services Security (WSS), Web Services Reliable Messaging (WSRM), efficient binary attachments (MTOM/XOP) as well as key transformation standards such as XSLT, XPath and XQuery. Synapse supports a number of useful functions out-of-the-box without programming, but it also can be extended using popular programming languages such as Java, JavaScript, Ruby, and Groovy.