https://freemqtt.cn/
MQTT Server | FreeMQTT
FreeMQTT MQTT3.1.1 MQTT5.0
mqtt server
https://www.ejabberd.im/
ejabberd XMPP Server with MQTT Broker & SIP Service
ejabberd is an XMPP server (Jabber server), MQTT broker and SIP gateway built to create awesome realtime services like massive chat, instant communication, IoT...
xmpp servermqtt brokerejabberdsipservice
https://repository.jboss.org/nexus/service/rest/repository/browse/central/cloud/thingslinker/onion-mqtt-server/
Index of /cloud/thingslinker/onion-mqtt-server
index ofcloudonionmqttserver