JetMQ

It is a fast and general MQTT broker for large-scale Internet of Things projects. JetMQ allows to build high-performance applications that are responsive, resilient, elastic and message-driven

# To try it just run

git clone http://github.com/butaji/JetMQ
cd JetMQ
docker-compose up -d

# now it's running. Check 1883 port

MQTT

MQTT is a machine-to-machine (M2M)/"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.
We are working to support v. 3.1.1, you can find it here.

JVM, Akka, Scala

This platform allows to build powerful concurrent & distributed applications more easily.Akka is a toolkit and runtime for building highly concurrent, distributed, and resilient message-driven applications on the JVM more information by the link http://akka.io