Event bus for Android and Java that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.
Pure Java ZeroMQ
Mirror of Apache Kafka
A distributed event bus that implements a RESTful API abstraction on top of Kafka-like queues
Java client for NATS
RabbitMQ Java client
Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.
A modular and portable open source XMPP client library written in Java for Android and Java (SE) VMs
Spring Integration provides an extension of the Spring programming model to support the well-known Enterprise Integration Patterns (EIP)