28 open-source Network & Monitoring vendors.

Open-source software for Network & Monitoring that you can self-host, with auditable source code — regardless of the developer's headquarters.

• CactiSelf-hosted / open source

  Open-source network and server monitoring based on RRDtool (GPL-2), maintained by The Cacti Group (US); self-hostable in your own data centre.

  United States

• CentreonEU sovereign

  French open-source IT monitoring platform for hybrid infrastructures

  France

• CheckmkEU sovereign

  Checkmk is an open-source IT infrastructure monitoring platform developed by Checkmk GmbH (Munich, Germany). In February 2025, US growth-equity firm PSG Equity acquired a majority controlling stake, making PSG (US) the ultimate parent. The software itself remains open source, but the company is no longer EU-controlled.

  Germany

• collectdSelf-hosted / open source

  German (Nuremberg) open-source (GPL/LGPL) system-statistics collection daemon written in C, with 100+ plugins for gathering performance metrics from systems and applications since 2005.

  Germany

• Grafana LabsNon-EU vendor

  Open-source observability platform with dashboards, founded in Sweden

  United States

• GraylogNon-EU vendor

  Graylog is a US-headquartered (Houston, TX) open-source log management and SIEM platform, originally founded in Hamburg, Germany. It is deployed in 50,000+ installations across 180 countries. The company raised $39M in growth funding from Silver Lake Waterman in 2023.

  United States

• IcingaEU sovereign

  German open-source monitoring framework, fork of Nagios with modern architecture

  Germany

• InfluxDBNon-EU vendor

  US (San Francisco) open-source time-series database (InfluxDB OSS) with a commercial cloud offering, widely used as the backend for infrastructure and IoT monitoring.

  United States

• JaegerSelf-hosted / open source

  Open-source, CNCF-graduated distributed tracing platform for microservices, originally developed by Uber.

  United States

• LibreNMSNon-EU vendor

  Open-source network monitoring system with auto-discovery and alerting

  United Kingdom

• MuninSelf-hosted / open source

  Open-source (GPL) networked resource monitoring tool with RRDtool graphing and a master/node architecture, maintained by an international community of volunteers with no controlling company.

  United States

• NagiosNon-EU vendor

  Open-source IT monitoring system for network and server monitoring

  United States

• ntopngSelf-hosted / open source

  Italian open-source network traffic monitoring and analytics platform

  Italy

• ObserviumNon-EU vendor

  Network monitoring platform with auto-discovery for switches, routers and servers

  United Kingdom

• openITCOCKPITSelf-hosted / open source

  German open-source IT monitoring platform with intuitive web interface

  Germany

• OpenNMSSelf-hosted / open source

  Open-source enterprise network and systems monitoring platform with a web UI, maintained by The OpenNMS Group (part of NantHealth since 2021).

  United States

• Pandora FMSEU sovereign

  Spanish monitoring platform from Madrid for infrastructure, network and application performance

  Spain

• RANCIDSelf-hosted / open source

  Open-source configuration and revision management for network devices (Really Awesome New Cisco confIg Differ) by Shrubbery Networks (US); self-hostable.

  United States

• SensuSelf-hosted / open source

  Open-core (MIT) monitoring and observability pipeline tool (Sensu Go), part of Sumo Logic since 2021, with an open-source core and commercial UI/SSO extensions.

  United States

• ShinkenSelf-hosted / open source

  French (Artigues-près-Bordeaux) open-source (AGPLv3) monitoring framework, Nagios-plugin compatible but with a distributed, message-bus architecture for large-scale network and systems monitoring.

  France

• SmokePingSelf-hosted / open source

  Swiss (Olten) open-source latency measurement and visualisation tool, developed by Tobias Oetiker (also known for RRDtool and MRTG), with RRDtool-based graphs of packet loss and latency.

  Switzerland

• TelegrafSelf-hosted / open source

  Open-source (MIT) metrics-collection agent by InfluxData, with 300+ plugins for collecting metrics, logs and events — a standalone project alongside InfluxDB itself.

  United States

• ThanosSelf-hosted / open source

  Open-source, CNCF-graduated project adding high availability and long-term storage to Prometheus, with global query federation across multiple clusters.

  United States

• UptraceEU sovereign

  German OpenTelemetry-native observability platform with an open-source core.

  Germany

• VictoriaMetricsNon-EU vendor

  VictoriaMetrics is an open-source time series database and monitoring solution headquartered in San Francisco, USA. Founded originally in Kyiv, Ukraine, the company offers both a self-hosted open-source product and a managed cloud service.

  United States

• WiresharkSelf-hosted / open source

  Open-source network protocol analyser (GPL-2), stewarded by the Wireshark Foundation, a US non-profit; runs locally on your own workstation.

  United States

• ZabbixEU sovereign

  Latvian open-source enterprise monitoring platform for networks, servers and cloud

  Latvia

• ZipkinSelf-hosted / open source

  Open-source (Apache 2.0) distributed tracing system that gathers timing data within microservice architectures, originally from Twitter and now community-maintained via OpenZipkin.

  United States