Device-Specific

• Arduino (more information)

• mbed (more information)

• mbed (simple port of the Arduino pubsubclient)

• mbed (native implementation)

• mbed (Paho Embedded C port)

• Nanode

• Netduino

• M2MQTT (works with .Net Micro Framework)

(see also devices page for more on hardware with built-in support)

Actionscript

• as3MQTT

C

• Eclipse Paho C

• libmosquitto

• libemqtt - an embedded C client

C++

• libmosquittopp

Clojure

• Machine Head

• Clojure MQTT Codec for Netty

Dart

• mqtt.dart

Delphi

• TMQTTClient (more information)

Erlang

• erlmqtt

• mqtt4erl

• my-mqtt4erl - updated fork of mqtt4erl

Go

• Eclipse Paho Go

Haskell

• mqtt-hs

Java

• Eclipse Paho Java

• Xenqtt Includes a client library, mock broker for unit/integration testing, and applications to support enterprise needs like using a cluster of servers as a single client, an HTTP gateway, etc.

• MeQanTT

• Fusesource mqtt-client

• moquette

• "MA9B" zip of 1/2 dozen mobile clients source code. Includes Android-optimized Java source that works with Android notifications, based on Paho

• IA92 - deprecated IBM IA92 support pack, use Eclipse Paho GUI client instead. A useful MQTT Java swing GUI for publishing & subscribing. The Eclipse Paho GUI is identical but uses newer client code

Javscript / Node.js

• Eclipse Paho HTML5 JavaScript over WebSocket.

• mqtt.js

• node_mqtt_client (more information)

• IBM-provided PhoneGap / Apache Cordova MQTT plug-in for Android - JavaScript API is identical to Eclipse Paho HTML5 JavaScript

• Ascoltatori - a node.js pub/sub library that allows access to Redis, AMQP, MQTT and ZeroMQ with the same API.

LotusScript

• MQTT From LotusScript

Lua

• Eclipse Paho Lua

.NET / dotNET

• MqttDotNet

• nMQTT

• M2MQTT

• KittyHawkMQ

Objective-C

• mqttIO-objC

• libmosquitto - via wrappers (example)

• MQTTKit (sample app)

• "MA9B" zip of 1/2 dozen mobile clients source code including Objective-C

OCaml

• mqtt_client

Perl

• net-mqtt-perl

• anyevent-mqtt-perl

• WebSphere-MQTT-Client

• Net::MQTT::Simple cpan github

PHP

• phpMQTT

• Mosquitto-PHP

Python

• Eclipse Paho Python - originally the mosquitto Python client

• nyamuk

• MQTT for twisted python

REXX

• REXX MQTT

Ruby

• ruby-mqtt

• em-mqtt

• mosquitto

Tcl

• tcl-mqtt