Google Cloud Messaging Alternatives

RabbitMQ gives your applications a common platform to send and receive messages, and your messages a safe place to live until received. RabbitMQ is a tool in the Message Queue category of a tech stack.

Firebase is a cloud service designed to power real-time, collaborative applications. Simply add the Firebase library to your application to gain access to a shared data structure; any changes you make to that data are automatically synchronized with the Firebase cloud and with other clients within milliseconds.