Open Source ESBs

差点忘了这个后起之秀——swordfish
http://www.eclipse.org/swordfish/

Mule
http://mule.codehaus.org
Lightweight ESB with a custom implementation model.

Apache ServiceMix
http://servicemix.apache.org
Apache JBI implementation with a lot of JBI components.

Open ESB
https://open-esb.dev.java.net
ESB developed by SUN with tool support from the NetBeans IDE.

Apache Synapse
http://ws.apache.org/synapse
ESB focused on web services support based on Apache Axis2.

JBoss ESB
http://labs.jboss.com/jbossesb/
The JBoss implementation of an ESB based on JBoss messaging.

Apache Tuscany
http://incubator.apache.org/tuscany
Implementation of the Service Component Architecture (SCA) specification.

Fuse ESB
http://open.iona.com/products/fuse-esb/
Iona?s Open Source ESB offering based on Apache ServiceMix.

WSO2 ESB
http://wso2.com/products/esb/
WSO2?s Open Source ESB offering based on Apache Synapse.

PEtALSh
http://petals.objectweb.org/
Another JBI based ESB, that is hosted by OW2 (former ObjectWeb).

OpenAdapter
ttps://www.openadaptor.org/
AI based platform that provides a number of adaptors to implement integration solutions.