The best open source alternative to Nagios is Zabbix, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Nagios and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Nagios are Netdata (Free, Open Source), Icinga (Freemium, Open Source), Cockpit Project (Free, Open Source) and Cacti (Free, Open Source).
Gather and analyze accurate statistics and performance metrics, visualize it, get notified about current and potential issues without delay, and take advantage of our time-tested professional development and support.
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Zabbix vs Nagios opinions
Almost everyone thinks Zabbix is a great alternative to Nagios.
Infrastructure-wide health monitoring & performance troubleshooting in one place. Collaborate in the same place as relevant data from your systems and applications, reducing mean time to acknowledge (MTTA), & mean time to resolution. (MTTR).
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Netdata vs Nagios opinions
pros, cons and recent comments
Super fast monitoring of the system, and also of the monitors the kernel of the system.
Makes it easy to administer Linux servers via a web browser. It allows you to easily perform simple tasks like storage administration, inspecting journals, starting & stopping services, monitoring & administering several servers at once.
PHP Server Monitor is a script that checks whether your websites and servers are up and running. It comes with a web based user interface where you can manage your services and websites, and you can manage users for each server with a mobile number and email address.
Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.