Nagios monitors hosts, systems, and networks, delivering alerts in real-time. Users can specify exactly what they want to be notified of.
The program can monitor network services including HTTP, NNTP, ICMP, POP3, and SMTP among others. To many, Nagios is the name in traffic monitoring. A comprehensive, all-bases-covered approach to network management. One of the most powerful free tools for cybersecurity professionals and small businesses alike.
Server monitoring is made easy in Nagios because of the flexibility to monitor your servers with both agent-based and agentless monitoring. With over 5000 different addons available to monitor your servers, the community at the Nagios Exchange have left no stone unturned.
You can try any of their solutions free for 60 days with no restrictions. Monitor your entire IT infrastructure, quickly sort log data, or analyze your bandwidth with Nagios.