wolfMQTT is a small, fast, portable MQTT client implementation, including support for TLS 1.3.

An MQTT client written in and for PHP.

Async Mqtt encoder and decoder for rust.

MQTT library block written in Siemens SCL for S7-300 PLC with CP343-1

Native Nim MQTT client library

Message Queuing Telemetry Transport Client 🤖

Open source Extension SDK for the HiveMQ Enterprise MQTT broker that you can use to extend the broker with custom functionality and integrate the broker with other external systems

An MQTT library for Waspmote's 3G Module

📮 Build valid and verified MQTT topics

🔁 MQTT library for Arduino that runs WiFi and MQTT in a tight loop, enabling async-like behavior for single-threaded microcontrollers.

An MQTT bridge to Google Cloud IoT Core

Simple MQTT version 3.1.1 library targeted to 32-bit microcontrollers providing a standard C library.

Webcam Control Through Raspberry Pi Using a Skywriter Hat and the MQTT Protocol

MQTT 3.1.1 (semi-conformant) library in golang