Nagios known as Nagios Core, is a free and open source computer-software application that monitors systems, networks and infrastructure. Developed by Nagios Enterprises
License: Open Source
NetCrunch offers a more user-friendly experience with comprehensive network mapping and built-in reporting tools, making it suitable for organizations seeking ease of use. In contrast, Nagios provides a highly customizable and powerful monitoring solution, favored by larger enterprises that require extensive configuration and control.