With the increased adoption of SOA, companies are finding the ESB (enterprise service bus) the "must have" application to connect disparate systems. Although a number of open source ESBs, such as Mule, OpenESB, Apache ServiceMix, and JBoss ESB have been around for a while, these products take a relatively heavyweight approach to integration by implementing the JBI (Java Business Integration) specification. A more recent open source arrival, WSO2 ESB, takes a lightweight approach, focusing on integration based on Web service standards.

Steven Núñez [1] , Principal Consultant for BRMS at Illation Pty. Ltd takes up WSO2 ESB for review on this article on InfoWorld [2]. He goes on to say "Development of the product is active and proceeding quickly; if progress continues at the current pace, a few more releases would make WSO2 worthy of consideration in most enterprise-level ESB deployments."

Story: http://www.infoworld.com/article/07/11/06/45TC-wso2-esb_1.html [3]