Cacti is a network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality.

Icinga is an open source computer system and network monitoring application.

NetCrunch is a Windows Server–based network monitoring tool that boasts high performance and impressive scalability even in a single-server deployment.

The Dude network monitor automatically scans all devices within specified subnets, draw and layout a map of your networks, monitor services of your devices an…

Datadog is a monitoring service for cloud-scale applications, bringing together data from servers, databases, tools, and services to present a unified view of…

Nagios known as Nagios Core, is a free and open source computer-software application that monitors systems, networks and infrastructure.

PRTG is a network monitoring tool that helps you to ensure that your computer systems are running smoothly and that no outages occur.

Zabbix is enterprise open source monitoring software for networks and applications.