Blackbird ESB
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Blackbird ESB is an enterprise service bus for PHP developers. It allows developers to take advantage of Service Oriented Architecture (SOA) development models plus the rapid application development possible by using PHP.
Blackbird was also designed to integrate closely with Apache ServiceMix. Both products use the same message queue back-end, Apache ActiveMQ. Developers can mix Java and PHP simply by configuring Blackbird and ServiceMix to use the same ActiveMQ service.