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
AppBeat is designed for ease of use with a focus on real-time monitoring and integration, making it suitable for teams looking for quick deployment. In contrast, Nagios offers extensive customization and community support, making it ideal for organizations that require detailed performance monitoring and have the resources to manage its complexity.