collectd

A daemon that collects system performance statistics periodically, and provides tons of plugins to store and analyze these values

     

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Eucalyptus

An open source software for building Amazon EC2-compatible private and hybrid cloud platforms

     

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Monit

An open source utility for managing and monitoring processes, programs, files, directories and filesystems

     

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Nagios Core

Nagios Core network monitoring software is a powerful, enterprise-class host, server, application, monitoring and alerting tool

     

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Netdata

netdata is a system for distributed real-time performance and health monitoring. It provides unparalleled insights, in real-time, of everything happening on the system it runs (including applications such as web and database servers), using modern interactive web dashboards.

     

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Rex

A agent-less server orchestration tool built on Perl

     

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Riemann

Riemann aggregates events from servers and applications, notifies exceptions, tracks latency, collects system statistics and more, all with a powerful stream processing language

     

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Statman

Statman makes it possible to instrument and collect statistics from your high-traffic production Erlang systems with very low overhead. The collected data points are aggregated in the VM and can be sent to services like Graphite, Munin, New Relic, etc.

     

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Zabbix

An open source, enterprise-class monitoring framework

     

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