NagiosGrapher is an extension of the established Nagios monitoring software, which prepares graphs from the performance data collected by Nagios.

NagVIS is an extension of the established Nagios monitoring software, which is used to graphically prepare the data collected by Nagios.

Prometheus, developed by the team behind SoundCloud, is an Open Source monitoring and alerting toolkit.

Xymon monitoring software is used to monitor computer systems and ensure their proper function.

Icinga is an Open Source application for monitoring system processes on various platforms.

The free Munin monitoring software, which is written in the Perl programming language, is used to monitor computer systems...

The free Nagios monitoring software is used to monitor computer systems and ensure their proper function.

Grafana, developed and maintained by Grafana Labs, is a server application used for the graphic presentation of various values.

Graphite is an Open Source application, developed by Orbitz, for monitoring various computer systems.

The Hobbit monitoring software is used to monitor computer systems and ensure their proper function.