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European Alternatives to Nagios

Centreon Logo

Centreon

France
EU
Open Source
Self-Hostable

Centreon is a French provider of IT monitoring and observability software, headquartered in Paris. The open-source project dates back to 2003, and its monitoring engine started as a fork of Nagios. The...

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Checkmk Logo

Checkmk

Germany
EU
Open Source
Self-Hostable
Non-European Parent Company

Checkmk is IT monitoring software from Checkmk GmbH in Munich. It began in 2008 as an add-on for Nagios by Mathias Kettner and was published under the GPL in 2009. The first...

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Icinga Logo

Icinga

Germany
EU
Open Source
Self-Hostable

Icinga is open-source monitoring software developed by Icinga GmbH in Nuremberg, Germany. The project started in 2009 as a fork of Nagios, and Icinga 2, a complete rewrite in C++, followed in...

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Zabbix Logo

Zabbix

Latvia
EU
Open Source
Self-Hostable

Zabbix is an open-source monitoring platform for networks, servers, virtual machines and cloud services. Alexei Vladishev created it in 2001 and released the first stable version in 2004. The company behind it...

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European alternatives to Nagios include Icinga and Checkmk (both Germany), Zabbix (Latvia) and Centreon (France). Several of them grew out of Nagios itself, so they can reuse much of its plugin knowledge. Nagios is a US company: Ethan Galstad founded Nagios Enterprises in 2007 in St. Paul, Minnesota, to offer consulting and development around the open-source Nagios Core, which has existed since 1999.

Where the alternatives come from

  • Icinga (Germany) started in 2009 as a fork of Nagios and has been a complete rewrite since Icinga 2 in 2014, but it stays compatible with the Nagios plugin interface.
  • Checkmk (Germany) began in 2008 as an add-on for Nagios and published its first official product release in 2012. Since 2025 a US private equity fund holds the vast majority of its holding company.
  • Centreon (France) built its monitoring engine as a fork of Nagios and adds log management and digital experience monitoring.
  • Zabbix (Latvia) is an independent design with agents, SNMP and auto-discovery and does not depend on Nagios plugins.

What to expect from a switch

Anyone moving away from Nagios usually wants a graphical configuration, automatic discovery of new hosts or better scaling. Icinga is the closest match for existing Nagios setups, because plugins and many concepts carry over. Checkmk and Zabbix offer more automation but need a new configuration. All four are run on the company's own servers, and none is a hosted service. They are compared in the infrastructure monitoring category.