mqtt-ir-transceiver by enc-X
ESP8266 based bidirectional bridge between MQTT and IR (change MQTT message to IR signal and change received IR signal to MQTT message)
created at May 23, 2016, 3:18 p.m.
serial2mqtt by vortex314
Implement a Linux gateway that reads serial port ( USB, serial , bluetooth) commands and transfers to MQTT host. MQTT without ethernet or Wifi on a low cost micocontroller. Don't develop a serial command interface , just use MQTT UI's and features.
created at Oct. 2, 2016, 9:18 p.m.
CODESYS-MQTT by stefandreyer
MQTT client library for CODESYS, supporting all QoS
created at July 10, 2018, 10:07 p.m.
helloiot by adrianromero
HelloIoT is a MQTT dashboard application.
created at April 21, 2016, 9:18 p.m.
MQTT-Tiles by flespi-software
Open-source MQTT-based IoT dashboard visualization tool. Has full MQTT 5.0 support. Allows easy dashboards sharing. Works with any MQTT broker supporting the WSS protocol.
created at July 24, 2019, 11:47 a.m.
lgtv2mqtt by hobbyquaker
Interface between LG WebOS Smart TVs and MQTT 
created at Dec. 6, 2015, 8:08 p.m.
AlexaMqttBridge by mhdawson
Bridge between Amazon Alexa and Mqtt
created at Dec. 27, 2016, 3:29 p.m.
d3-MQTT-Topic-Tree by hardillb
A MQTT Topic Tree viewer using the d3 collapsable tree and MQTT over websockets
created at March 26, 2013, 9:03 p.m.
MQTT-Board by flespi-software
Diagnostic-oriented MQTT client tool. Supports MQTT 5.0 and 3.1.X protocols, connections to multiple brokers, MQTT operations logs and multiple subscribe widgets with unique/history topic filtering mode. Saves configuration in browser's local cache.
created at Oct. 16, 2018, 8:08 a.m.
aqara-mqtt by monster1025
Aqara (Xiaomi) Gateway to MQTT bridge (I use it for home assistant integration)
created at Jan. 13, 2017, 5:47 a.m.
mqtt2opcua by nzfarmer1
MQTT to OPCUA protocol converter/gateway
created at July 21, 2015, 11:35 p.m.