Pushbullet - Pushbullet - Your devices working better together
RabbitMQ - RabbitMQ is an open source message broker software.
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
Gotify - a simple self-hosted server for sending and receiving messages
Hyperledger - Hyperledger is a multi-project open source collaborative effort hosted by The Linux Foundation, created to advance cross-industry blockchain technologies.