IBM Websphere MQ Telemetry
The Telemetry MQTT feature is built-in optionally licensed feature in WebSphere MQ version 7.1 and above. It provides full MQTT v3.1 support, IBM MQ and JMS support. IBM WebSphere MQ Advanced includes the MQTT license at no charge. It ships with reference Java (MIDP and above), C and JavaScript (MQTT over WebSocket) clients. Eclipse Paho is highly recommended by IBM.

IBM MessageSight
DMZ secure MQTT appliance with hardware messaging acceleration for M2M and mobile applications requiring extreme volume, low latency, FIPS 140-2 and NSA Suite B security. Messaging provider for MQTT, HTML5 WebSockets, JMS. Includes C, Java, JavaScript, Apache Cordova/PhoneGap, ObjectiveC clients. Also connects/bridges IBM MQ, IBM Integration Bus, WebSphere MessageBroker.

IBM Integration Bus
IBM Integration Bus V9 has Telemetry feature built-in as optional licensed feature. IBM WebSphere MessageBroker V7 & V8 also include it as optionally licensed feature.]]

Really Small Message Broker
75KB MQTT broker runtime free download as binaries from IBM alphaWorks, RSMB is a C implementation of a tiny MQTT server suitable for development, embedded systems, concentrators or small to medium sized deployments. It provides complete MQTT v3.1 support, bridging, and a C client API.

Mosquitto
An Open Source MQTT server with C, C++, Python. For JavaScript, Mosquitto recommends the Eclipse Paho Javascript client. A public, hosted test server is also available (more information)

Eclipse Paho
The Eclipse Paho project hosts an instance of the mosquitto broker as a public test sandbox for the Machine-to-Machine Industry Working Group (more information).

Eurotech Everywhere Device Cloud
A cloud-based service provided by Eurotech

Xively
The Xively service, formerly known as Cosm, formerly known as Pachube, provides a data cloud for the Internet of Things, with MQTT support in beta. This is not a generic MQTT broker implementation; it uses MQTT as a transport for publishing and subscribing to your already existing data feeds (more information).

eMQTT
An Erlang MQTT broker.

m2m.io
A cloud messaging service (more information)

webMethods Nirvana Messaging
A messaging engine with support for many different transports. Their MQTT support is described here.

RabbitMQ
An AMQP message broker – with an MQTT plugin (bundled in version 3.x onwards). A public test server is also available (more information)

Apache ActiveMQ
Details of “classic” ActiveMQ’s support for MQTT are available here.

Apache Apollo
The “next generation” of ActiveMQ supports MQTT via a plugin.

Moquette
A Java MQTT broker based on an eventing model with Apache Mina.

HiveMQ
HiveMQ is a MQTT broker which was built from the ground up with maximum scalability and enterprise-ready security in mind. A public test server is also available (more information)

Mosca
A node.js MQTT broker that can be plugged on top of Redis, AMQP, MQTT or ZeroMQ.

More information on brokers

• compare the capabilities of different brokers
• see some of the public brokers available for testing on the wiki

Note: although there are a range of options available for developers interested in MQTT, not all of the client APIs listed below are current. Some are at an early or experimental stage of development, whilst others are stable and mature. Additionally, some may not provide full support for all of the features of the latest MQTT specification – for example, some may only support QoS 0, not include authentication, etc.

Check with the provider for the current status of your preferred language implementation; and remember to respect the licenses that different implementations are published under.

Device Specific

• Arduino (more information)
• mbed (more information)
• Nanode
• Netduino
• M2MQTT for .Net Micro Framework

Actionscript

• as3MQTT

C

• Eclipse Paho
• libmosquitto

C++

• libmosquittopp

Delphi

• TMQTTClient (more information)

Erlang

• erlmqtt
• mqtt4erl
• my-mqtt4erl - fork of mqtt4erl

Java

• Eclipse Paho
• MeQanTT
• mqtt-client
• moquette
• "MA9B" zip of 1/2 dozen mobile clients source code. Includes Android optimized Java source that works with Android notifications
• IA92 - IA92 support pack, use Eclipse Paho instead. Does include very useful MQTT Java swing GUI for publishing & subscribing.]]

Javscript / Node.js

• Eclipse Paho HTML5 JavaScript for MQTT over WebSocket. >13,000 messages/sec subscribe on iPad :-)
• mqtt.js
• node_mqtt_client (more information)
• PhoneGap / Apache Cordova MQTT plug-in for Android mobiles. JavaScript API is identical to Eclipse Paho HTML5 JavaScript
• mosquitto websocket client (deprecated, use Eclipse Paho JavaScript
• Ascoltatori, a pub/sub library that allow to access Redis, AMQP, MQTT and ZeroMQ with the same API.

LotusScript

• MQTT From LotusScript

Lua

• mqtt_lua

.NET

• MqttDotNet
• nMQTT
• M2MQTT

Objective-C

• mqttIO-objC
• libmosquitto - via wrappers (example)
• "MA9B" zip of 1/2 dozen mobile clients source code including ObjectiveC

Perl

• net-mqtt-perl
• anyevent-mqtt-perl
• WebSphere-MQTT-Client

PHP

• phpMQTT

Python

• python-mosquitto
• nyamuk
• MQTT for twisted python

REXX

• REXX MQTT

Ruby

• ruby-mqtt
• em-mqtt

A number of tools make it simple to publish or subscribe on MQTT topics. Some are web-based, others are desktop.

• mqtt.io - a beautiful, functional web-based client for “any” MQTT broker available on a public IP address. Very handy for running quick tests from any browser.
• Eclipse Paho - provides an Eclipse view which can interact with a broker for testing.
• MQTT.app - an OS X desktop test application (simple pub/sub) by 2lemetry, available from the Mac App Store.
• SimpleMessage - a basic OS X desktop client based on the Paho C client.
• IA92 - IA92 support pack includes very useful MQTT Java swing GUI for publishing & subscribing.]]
• mqtt-http-bridge
• MQTT over websockets (experimental) - from the mosquitto project

MQTT has been incorporated into various runtimes and frameworks via modules or plugins. The projects listed below therefore depend on additional packages and are not necessarily standalone or for general use. As with the list of clients, some may not provide full support for all of the features of the latest MQTT specification – check with the project in question.

• Ant – an Ant task (using the IA92 Java client)
• bzr-mqtt – an MQTT commit plugin for Bazaar/bzr servers (uses the Python API from mosquitto)
• Github – an MQTT service hook for Github (more on the blog)
• moquette-mqtt – an MQTT plugin for Apache Mina, written in Java
• mule-module-mqtt – a Mule ESB Connector
• TDI MQTT – a Tivoli Directory Integrator plugin based on (the deprecated) IA92 SupportPac client
• Wireshark - a partial MQTT dissector/decoder for Wireshark
• zmqtt – an MQTT module for Zotonic, an Erlang framework

On the discussion threads we talk about many products that use MQTT. Many of them don't publicly declare it. Others are programable so are oblivious to MQTT being run on them. Lets make a list of ones we do know of are using MQTT. Here are a few to start:

• http://www.consert.comToshiba Consert smart grid solutions
• http://www.eurotech.com SCADA, monitoring, controllers, etc
• http://www.celllabs.com/ Automated Meter Reading
• http://www.cirrus-link.com Arlen Nipper's company for $120 ODB2 GSM/GPS/MQTT dongles
• http://www.shaspa.com Shaspa home automation
• http://www.choral.it Choral GPS/GSM tracking module (check which models have MQTT)

Heard of many deployments of MQTT. Lets make a list. I'll start you off:

• Facebook Messenger - 680M users as of Spring 2013, expected to hit 1B by 2014.
• Conoco Phillips Pipeline - 30,000 devices on 17,000km of pipeline monitored & controlled via MQTT on Satellite links. Enables real-time conditional maintenance.
• St Jude Medical - 100,000 heart pacemakers monitored via MQTT
• Toshiba Consert - smart energy grid solution provider built on MQTT
• Sprint Velocity - Connected Car / Telematics provider. Quite public about their use of IBM MessageSight hardware accelerated MQTT for “key fob” response time for smartphone>Sprint Velocity cloud>car and back.