RabbitMQ - RabbitMQ is an open source message broker software.
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
ZeroMQ - ZeroMQ is a high-performance asynchronous messaging library.
AlienVault USM (from AT&T Cybersecurity) - AlienVault USM Anywhere delivers powerful threat detection, incident response, and compliance management for cloud, on-premises, and hybrid environments.
Apache ActiveMQ - Apache ActiveMQ is an open source messaging and integration patterns server.
Tenable.io - Tenable.io Cyber Exposure platform helps to protect any asset on any computing platform and eliminate blind spots.