MQTT vs EMQ: What are the differences?
What is MQTT? A machine-to-machine Internet of Things connectivity protocol. It was designed as an extremely lightweight publish/subscribe messaging transport. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.
What is EMQ? The Scalable MQTT Broker for IoT and Mobile Applications. It is fully open source and licensed under the Apache Version 2.0. It implements both MQTT V3.1 and V3.1.1 protocol specifications, and supports MQTT-SN, CoAP, WebSocket, STOMP and SockJS at the same time.
MQTT and EMQ can be primarily classified as "Message Queue" tools.
EMQ is an open source tool with 181 GitHub stars and 96 GitHub forks. Here's a link to EMQ's open source repository on GitHub.