How to: Monitoring
*Monitoring software.*

* [Alerta](https://github.com/guardian/alerta) - Distributed, scaleable and flexible monitoring system.
* [Canopsis](http://www.canopsis.org) - Opensource Hypervision and Data Aggregation Software
* [Cacti](http://www.cacti.net) - Web-based network monitoring and graphing tool.
* [Cabot](http://cabotapp.com/) - Monitoring and alerts, similar to PagerDuty.
* [Centreon](http://www.centreon.com) - IT infrastructure and application monitoring for service performance.
* [check_mk](http://mathias-kettner.com/check_mk.html) - Collection of extensions for Nagios.
* [Flapjack](http://flapjack.io/) - Monitoring notification routing & event processing system.
* [Icinga](https://www.icinga.org/) - Fork of Nagios.
* [LibreNMS](https://github.com/librenms/librenms/) - fork of Observium.
* [Monit](http://mmonit.com/monit/#home) - Small Open Source utility for managing and monitoring Unix systems.
* [Munin](http://munin-monitoring.org/) - Networked resource monitoring tool.
* [Naemon](http://www.naemon.org/) - Network monitoring tool based on the Nagios 4 core with performance enhancements and new features.
* [Nagios](http://www.nagios.org/) - Computer system, network and infrastructure monitoring software application.
* [Node-Bell](https://github.com/eleme/node-bell) - Real-time anomalies detection for periodic time series, metrics monitor.
* [Observium](http://www.observium.org/) - SNMP monitoring for servers and networking devices. Runs on linux.
* [Opsview](http://www.opsview.com/solutions/core) - Based on Nagios 4, Opsview Core is ideal for small IT and test environments.
* [Riemann](http://riemann.io/) - Flexible and fast events processor allowing complex events/metrics analysis.
* [Sensu](http://sensuapp.org/) - Open source monitoring framework.
* [Sentry](https://getsentry.com/) - Application monitoring, event logging and aggregation.
* [Serverstats](https://sourceforge.net/projects/serverstats.berlios/) - A simple tool for creating graphs using rrdtool. ([source on github](https://github.com/ddanier/serverstats))
* [Seyren](https://github.com/scobal/seyren) - An alerting dashboard for Graphite.
* [Shinken](http://www.shinken-monitoring.org/) - Another monitoring framework.
* [Xymon](http://www.xymon.com/) - Network monitoring inspired by Big Brother.
* [Zabbix](http://www.zabbix.com/) - Enterprise-class software for monitoring of networks and applications.
* [Zenoss](http://community.zenoss.org) - Application, server, and network management platform based on Zope.

*Monitoring dashboards.*

* [Adagios](http://adagios.org/) - Web based Nagios configuration interface.
* [Dash](https://github.com/afaqurk/linux-dash) - A low-overhead monitoring web dashboard for a GNU/Linux machine.
* [Thruk](http://www.thruk.org/) - Multibackend monitoring web interface with support for Naemon, Nagios, Icinga and Shinken.
* [Uchiwa](https://uchiwa.io) - Simple dashboard for the Sensu monitoring framework.

*Monitoring distributions.*

* [OMD](http://omdistro.org/) - The Open Monitoring Distribution.