RabbitMQ - RabbitMQ is an open source message broker software.
Azure IoT Hub - Manage billions of IoT devices with Azure IoT Hub, a cloud platform that lets you easily connect, monitor, provision, and configure IoT devices.
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
ThingSpeak - Open source data platform for the Internet of Things. ThingSpeak Features
Hyperledger - Hyperledger is a multi-project open source collaborative effort hosted by The Linux Foundation, created to advance cross-industry blockchain technologies.
AWS IoT - Easily and securely connect devices to the cloud.