1.eclipse-mosquitto / mosquittoEclipse Mosquitto - An open source MQTT brokermqttbrokermosquittoeclipse-iotiotmessaging+3 moreCOther license11K total2.7K forks+28 starsfrom 11,306 · score 3.37
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3.cesanta / mongooseEmbedded web server, with TCP/IP network stack, MQTT and Websocketwebsocketmqttembeddedwebserverweb-serveriot+5 moreCOther license13K total3K forks+7 starsfrom 13,117 · score 2.08
4.rabbitmq / rabbitmq-serverOpen source RabbitMQ: core server and tier 1 (built-in) pluginsrabbitmqamqpmessagingamqp-0-9-1amqp1-0mqtt+4 moreJavaScriptOther license14K total4K forks+4 starsfrom 13,949 · score 1.61
5.arboeh / huABusMQTT bridge for Huawei solar inverters (SUN2000/3000/5000) → Home Assistantevcchuawei-solarmodbusmqtthome-assistanthome-automation+2 morePythonOther license10 total6 forks+1 starsfrom 9 · score 0.69