New scalable, fault-tolerant, and efficient open-source MQTT broker

1. tbmq

   1 3 656 9.8 Java

   Open-source, scalable, and fault-tolerant MQTT broker able to handle 4M+ concurrent client connections, supporting at least 3M messages per second throughput per single cluster node with low latency delivery. The cluster mode supports more than 100M concurrently connected clients.

   

2. InfluxDB

   www.influxdata.com featured

   InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

   

3. rumqtt

   2 34 1,826 6.2 Rust

   The MQTT ecosystem in rust

   

   https://github.com/bytebeamio/rumqtt

   Disclaimer: have not tried it myself. I was, however, considering using it to replace Mosquitto as a broker.

4. EmbeddedMqttBroker

   3 1 90 4.1 C++

   This is a Mqtt broker for embedded devices, developed in C++, FreeRTOS to use advanced multitasking capabilities, and arduino core. Tested in an Esp32 and esp8266.

   

5. TinyMqtt

   4 3 210 5.9 C++

   ESP 8266 / 32 / WROOM Small footprint Mqtt Broker and Client

   

   Several different implementations exist, MQTT is a very lightweight protocol so this is very possible.

   https://github.com/hsaturn/TinyMqtt

6. Mongoose

   5 34 11,785 9.4 C

   Embedded web server, with TCP/IP network stack, MQTT and Websocket (by cesanta)

   

7. NATS

   6 124 17,316 9.9 Go

   High-Performance server for NATS.io, the cloud and edge native messaging system.

   

   Why wasn't NATS[1] used ?

   Written in Go, single-binary deployment... there's a lot to love about NATS !

   [1]https://nats.io/

8. Netty

   7 55 34,171 9.9 Java

   Netty project - an event-driven asynchronous network application framework

   

   We use Netty (https://netty.io/) as the source of the MQTT communication, and we build the MQTT features the MQTT broker should support ourselves on top of that.

9. SaaSHub

   www.saashub.com featured

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

10. vernemq

    8 5 3,337 7.6 Erlang

    A distributed MQTT message broker based on Erlang/OTP. Built for high quality & Industrial use cases. The VerneMQ mission is active & the project maintained. Thank you for your support!

    

    Shameless plug since i'm a contributor but VerneMQ [1] is a pretty programmable one. You have options from using webhooks to writting your plugins in Lua or Erlang/Elixir.

    * https://github.com/vernemq/vernemq

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