What are some alternatives?
When comparing NServiceBus and ZeroMQ, you can also consider the following products
IBM App Connect - IBM App Connect is the all-in-one integration tool for connecting apps, integrating data, building APIs and acting on events
Apache Kafka - Apache Kafka is an open-source message broker project developed by the Apache Software Foundation written in Scala.
Apache Camel - Apache Camel is a versatile open-source integration framework based on known enterprise integration patterns.
RabbitMQ - RabbitMQ is an open source message broker software.
Software AG webMethods - Software AG’s webMethods enables you to quickly integrate systems, partners, data, devices and SaaS applications
IBM MQ - IBM MQ is messaging middleware that simplifies and accelerates the integration of diverse applications and data across multiple platforms.