RabbitMQ - RabbitMQ is an open source message broker software.
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
D-Bus - D-Bus is a message bus system, a simple way for applications to talk to one another.
Hyperledger - Hyperledger is a multi-project open source collaborative effort hosted by The Linux Foundation, created to advance cross-industry blockchain technologies.
mosquitto - Eclipse Mosquitto is an open source (EPL/EDL licensed) message broker that implements the MQTT protocol versions 5.0, 3.1.1 and 3.1. Mosquitto is lightweight and is suitable for use on all devices