MQTT (Message Queue Telemetry Transport) is a lightweight, publish-subscribe messaging protocol that is commonly used in the Internet of Things (IoT) and other machine-to-machine (M2M) communication systems. MQTT brokers are servers that receive and send MQTT messages.

Some of the most popular MQTT brokers are:

• Mosquitto:
  An open-source MQTT broker that is widely used and easy to set up.

• HiveMQ:
  A commercial MQTT broker that is designed for enterprise-level applications and offers a range of features and tools for managing and scaling MQTT deployments.

• VerneMQ:
  An open-source MQTT broker that is optimized for high-scale and high-concurrency environments.

• CloudMQTT:
  A cloud-based MQTT broker that is easy to set up and can be used with a variety of cloud services.

• ActiveMQ:
  An open-source message broker that supports a range of protocols, including MQTT, and is designed for use in enterprise-level applications.

These are just a few examples of popular MQTT brokers, and there are many others to choose from depending on your needs and requirements.

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