ubus - User space inter process communication that adheres to the Unix philosophy.
RabbitMQ - RabbitMQ is an open source message broker software.
Apache Kafka - Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.
nanomsg - nanomsg is a socket library that provides several common communication patterns.
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
Apache ActiveMQ - Apache ActiveMQ is an open source messaging and integration patterns server.