RabbitMQ - RabbitMQ is an open source message broker software.
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
Apache Kafka - Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.
8base - Rethink development using 8base's low-code development platform.
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Porter - Heroku that runs in your own cloud