RabbitMQ - RabbitMQ is an open source message broker software.
Amazon MQ - Amazon MQ is a managed message broker service for ActiveMQ that makes it easy to set up and operate message brokers in the cloud. Easily migrate messaging.
Apache ActiveMQ - Apache ActiveMQ is an open source messaging and integration patterns server.
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Solace PubSub+ - Solace PubSub+ is a platform that empowers businesses to develop, deploy, and administer their architectures on cloud and IoT setups.
Apache Kafka - Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.