Apache Camel - Apache Camel is a versatile open-source integration framework based on known enterprise integration patterns.
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.
Azure Service Bus - Learn how to set up messaging that connects applications and services across on-premises and cloud environments. Tutorials, videos, API references, and more.
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Software AG webMethods - Software AG’s webMethods enables you to quickly integrate systems, partners, data, devices and SaaS applications
Apache Qpid - Apache Qpid makes messaging tools that speak AMQP and support many languages and platforms.