Datadog is a monitoring service for cloud-scale applications, bringing together data from servers, databases, tools, and services to present a unified view of…

Nagios known as Nagios Core, is a free and open source computer-software application that monitors systems, networks and infrastructure.

Pandora FMS (Pandora Flexible Monitoring System) is software for monitoring computer networks.

Spiceworks is a professional network for the information technology (IT) industry.

LibreNMS is an auto-discovering PHP/MySQL-based network monitoring system.

Observium is a low-maintenance auto-discovering network monitoring platform supporting a wide range of device types, platforms and operating systems, etc.

Pulseway is a mobile-first IT management software.

Zabbix is enterprise open source monitoring software for networks and applications.