The Dude - MikroTik is a Latvian company which was founded in 1996 to develop routers and wireless ISP systems. MikroTik now provides hardware and software for Internet connectivity in most of the countries around the world.
Azure Network Watcher - Azure Network Watcher provides multiple features to help you visualize key parameters, track, troubleshoot, and activate or deactivate logs for resources in an Azure virtual network.
Pandora FMS - Pandora FMS: Opensource monitoring software
SaltStack - SaltStack event-driven automation delivers security, cloud and configuration management for a software-defined world and enterprise complexity and scale.
cStatus - Monitor and scan a network.
Obkio - Simple Network Monitoring and Network Troubleshooting software to empower users to identify and troubleshoot network & application slowdown from the end-user perspective.