Mule is the world's most widely used open source Enterprise Service Bus (ESB). Designed to support high-performance, multi-protocol transactions between heterogeneous systems and services, Mule provides the basis for service oriented architecture (SOA). With a standards-based, zero intrusion approach to existing infrastructure and a simplified development model, Mule adapts to your environment and prevents vendor lock-in. The open source model allows organizations to achieve rapid ROI, and open access to source code enables developers to customize Mule to readily meet their needs.