High Quality Content by WIKIPEDIA articles! RabbitMQ is an open source message broker software (message-oriented middleware), using the standard Advanced Message Queuing Protocol (AMQP). The RabbitMQ server is written in Erlang and is built on the Open Telecom Platform framework for clustering and failover. Rabbit Technologies Ltd., acquired in April 2010 by VMware, develops and provides support for RabbitMQ. The source code is released under the Mozilla Public License.