RabbitMQ - RabbitMQ is an open source message broker software.
Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Apache Kafka - Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Apache ActiveMQ - Apache ActiveMQ is an open source messaging and integration patterns server.