PRTG is a network monitoring tool that helps you to ensure that your computer systems are running smoothly and that no outages occur. Developed by Paessler AG
License: Freemium
Nagios is a powerful open-source monitoring tool that excels in customization and flexibility, making it suitable for complex IT environments. In contrast, PRTG Network Monitor offers a user-friendly interface and comprehensive monitoring features, making it a better choice for organizations looking for ease of use and quick deployment.