CrystalMQ is a hosted MQTT server solution to build a powerful industrial & commercial IoT applications. crystalMQ is a secured MQTT server application which uses Bevywise MQTTRoute that comes with more options to deploy own AI/ML algorithms & customizable widgets to build own user interface.
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mosquitto - Eclipse Mosquitto is an open source (EPL/EDL licensed) message broker that implements the MQTT protocol versions 5.0, 3.1.1 and 3.1. Mosquitto is lightweight and is suitable for use on all devices
CloudMQTT - CloudMQTT implements MQ Telemetry Transport protocol for carrying out messaging using a publish/subscribe message queueing model.
MQTT Explorer - An all-round MQTT client that provides a structured topic overview
EMQX - EMQX is an open source MQTT 5.0 broker for mission-critical IoT scenarios, massively scalable and highly available clustering, running anywhere from edge to cloud.
HiveMQ - HiveMQ is the MQTT based messaging platform for fast, efficient and reliable data movement to and from connected IoT devices and enterprise systems
MQTT.fx - MQTT.fx is a MQTT Client written in Java based on Eclipse Paho.