Best Free System Monitoring Software of 2025

Nagios Core, the monitoring and alerting engine, is the core application that powers hundreds of Nagios project development. Nagios Core is the event scheduler, event processor, alert manager, and monitor for elements. It has several APIs that can be used to extend its capabilities to do additional tasks. It is implemented in C for performance reasons and is designed to run natively under Linux/*nix systems.

This is IT management and monitoring done right. You can quickly see the whole picture and respond to any issues. All of the above, plus remote control and patch management, are all included in one elegant and simple-to-use tool. Have you got a minute? It takes just minutes to install a lightweight, powerful agent on all your devices. You will receive detailed information about your IT environment within minutes. We make IT administration simple. Automated discovery of devices and services in your IT environment. Remotely install applications and run scripts. All you need in one tool. It is unacceptable to experience downtime. Panorama9 can help you avoid problems by anticipating them so that you can be proactive rather than reactive. Panorama9 instantly notifies you if something goes wrong so you can take corrective action before your users notice. Your security is only as strong and secure as the weakest link. We'll show you.