Apache ServiceMix is an enterprise-class open-source distributed enterprise service bus (ESB) and service-oriented architecture (SOA) toolkit ^{[disambiguation needed]}. It was built from the ground up on the semantics and APIs of the Java Business Integration (JBI) specification JSR 208 and released under the Apache License. ServiceMix 4 also fully supports OSGi. ServiceMix is lightweight and easily embeddable, has integrated Spring support and can be run at the edge of the network (inside a client or server), as a standalone ESB provider or as a service within another ESB. You can use ServiceMix in Java SE or a Java EE application server. ServiceMix uses ActiveMQ to provide remoting, clustering, reliability and distributed failover. The basic frameworks used by ServiceMix are Spring and XBean. ^[1]

ServiceMix is often used with Apache ActiveMQ, Apache Camel and Apache CXF in SOA infrastructure projects.