Nagios.

Open-source IT monitoring system for network and server monitoring

Facts

Centreon
French open-source IT monitoring platform for hybrid infrastructures
FR · open-source
↗
Checkmk
German IT monitoring platform for servers, networks and cloud infrastructure
DE · open-source
↗
Grafana Labs
Open-source observability platform with dashboards, founded in Sweden
SE · open-source
↗
Graylog
German open-source log management platform for centralised log management and SIEM
DE · open-source
↗
Icinga
German open-source monitoring framework, fork of Nagios with modern architecture
DE · open-source
↗
VictoriaMetrics
Open-source time-series database and monitoring solution, fast and scalable
FI · open-source
↗
Zabbix
Latvian open-source enterprise monitoring platform for networks, servers and cloud
LV · open-source
↗
ntopng
Italian open-source network traffic monitoring and analytics platform
IT · open-source
↗