RabbitMQ

RabbitMQ is the open-source message broker: it accepts messages from publishers, routes them via exchanges, and delivers them reliably to consumers using protocols like AMQP and MQTT.

RabbitMQ is your enterprise-grade, open-source message broker, built on Erlang for high concurrency and reliability. It acts as a robust intermediary, decoupling your service components by accepting messages from producers and routing them to designated queues through 'exchanges' (a key concept). This architecture is critical for modern distributed systems, specifically microservices, where asynchronous communication is non-negotiable. It handles high-volume task queues, like image processing or email distribution, ensuring message delivery with features like persistence and acknowledgments. We support multiple protocols: AMQP 0-9-1 is the foundation, but it extends to MQTT and STOMP via its plug-in architecture.

https://www.rabbitmq.com