
Description: nanomsg is an open source library that provides a simple high-performance messaging system for distributed and concurrent applications. It implements several common messaging patterns such as request/reply, publish/subscribe, and survey. nanomsg is designed to be lightweight, scalable, and portable across operating systems and languages.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: ActiveMQ is an open source message broker that implements the Java Message Service (JMS) API for sending, receiving, and persisting messages between distributed applications. It supports many advanced messaging features like message queues, topic publishing and subscribing, reliability, and security.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API