List of Top Free Open Source & Self Hosted Application for Monitoring

Monitoring software.

Adagios – Web based Nagios interface for configuration and monitoring (replacement to the standard interface), and a REST interface. AGPL-3.0 Docker/Python
Alerta – Distributed, scaleable and flexible monitoring system. Apache-2.0 Python
Bloonix – Bloonix is a monitoring solution that helps businesses to ensure high availability and performance. GPL-3.0 Perl
Bosun – Monitoring and alerting system by Stack Exchange MIT Go
Cabot – Monitoring and alerts, similar to PagerDuty. MIT Python
Cacti – Web-based network monitoring and graphing tool. GPL-2.0 PHP
cadvisor – Analyzes resource usage and performance characteristics of running containers Apache-2.0 Go
checkmk – Comprehensive solution for monitoring of applications, servers, and networks. Python/PHP
dashdot – A simple, modern server dashboard for smaller private servers. MIT Nodejs/Docker
EdMon – A command-line monitoring application helping you to check that your hosts and services are available, with notifications support. MIT Java
eZ Server Monitor – A lightweight and simple dashboard monitor for Linux, available in Web and Bash application. GPL-3.0 PHP/Shell
Healthchecks – Monitoring for cron jobs, background services and scheduled tasks. BSD-3-Clause Python
Icinga – Nagios fork that has since lapped nagios several times. Comes with the possibility of clustered monitoring. GPL-2.0 C++
LibreNMS – Fully featured network monitoring system that provides a wealth of features and device support. GPL-3.0 PHP
Linux Dash – A low-overhead monitoring web dashboard for a GNU/Linux machine. MIT Nodejs/Go/Python/PHP
Monit – Small utility for managing and monitoring Unix systems. AGPL-3.0 C
Munin – Networked resource monitoring tool. GPL-2.0 Perl/Shell
Naemon – Network monitoring tool based on the Nagios 4 core with performance enhancements and new features. GPL-2.0 C
Nagios – Computer system, network and infrastructure monitoring software application. GPL-2.0 C
Netdata – Distributed, real-time, performance and health monitoring for systems and applications. Runs on Linux, FreeBSD, and MacOS. GPL-3.0 C
NetXMS – Open Source network and infrastructure monitoring and management. LGPL-3.0/GPL-3.0 Java/C++/C
Observium – SNMP monitoring for servers and networking devices. Runs on linux.
OMD – The Open Monitoring Distribution.
Performance Co-Pilot – Lightweight, distributed system performance and analysis framework.
PHP Server Monitor – Open source tool to monitor your servers and websites.
PhpSysInfo – A customizable PHP script that displays information about your system nicely.
pyDash – Small web-based monitoring dashboard for linux.
Riemann – Flexible and fast events processor allowing complex events/metrics analysis.
rtop – an interactive, remote system monitoring tool based on SSH.
Scrutiny – Hard Drive S.M.A.R.T Monitoring, Historical Trends & Real World Failure Thresholds
Sensu – Monitoring tool for ephemeral infrastructure and distributed applications.
Status – Simple and lightweight system monitoring tool for small homeservers with a pleasant web interface. MIT Python
Thruk – Multibackend monitoring web interface with support for Naemon, Nagios, Icinga and Shinken.
Zabbix – Enterprise-class software for monitoring of networks and applications.