In Forrester's 109-criteria evaluation of both commercial and open source enterprise service bus (ESB) vendors, we found that Software AG, Tibco Software (Tibco), Oracle, and Progress Software are Leaders because of their broad functionality across the architecture, orchestration, mediation, connection, and change and control areas of this evaluation. Two open source ESBs from FuseSource and WSO2 also made the Leader category, as did two separate ESB products from IBM. In addition, two other open source products from MuleSoft and Red Hat scored as Strong Performers along with a third ESB product from IBM.