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Open source network monitoring tools in 2026

Devices, links, latency and traffic: SNMP polling, flow analysis and path monitoring. This list has 13 network monitoring tools. Of these, 13 are open source, 13 have a free plan and 13 can be self-hosted. Checked by hand on 30 September 2026.

  1. 1

    Akvorado

    Flow collector and visualizer that receives NetFlow, IPFIX and sFlow, enriches flows with interface and routing data, stores them in ClickHouse and shows them in a web UI.

    Free Open source (AGPL-3.0) Self-hosted NetworkDashboards
  2. 2

    Cacti

    Network graphing tool built on RRDtool: polls devices over SNMP or scripts and draws long-term graphs of traffic and system metrics.

    Free Open source (GPL-2.0) Self-hosted InfrastructureMetricsDashboards
  3. 3

    Checkmk

    Infrastructure monitoring for servers, networks, cloud and containers with automatic service discovery; the base edition is open source and paid editions add more.

    Free plan Open source (GPL-2.0) Self-hosted InfrastructureKubernetesDashboards
  4. 4

    Hubble

    Network observability layer for Cilium that shows service dependencies, network flows and DNS and HTTP traffic between Kubernetes workloads, using eBPF.

    Free Open source (Apache-2.0) Self-hosted KubernetesNetwork
  5. 5

    LibreNMS

    Network monitoring system with automatic SNMP discovery, graphs and alerting, supporting a long list of network hardware vendors.

    Free Open source (GPL-3.0) Self-hosted InfrastructureMetrics
  6. 6

    NetAlertX

    Self-hosted scanner that discovers devices on your network and alerts when new, unknown or offline devices appear.

    Free Open source (GPL-3.0) Self-hosted NetworkNotifications
  7. 7

    Netdisco

    Open source network management tool that discovers switches and routers over SNMP and lets you locate devices by MAC or IP, browse ports and track inventory.

    Free Open source (BSD-3-Clause) Self-hosted NetworkInfrastructure
  8. 8

    NetXMS

    Network and infrastructure management system with SNMP discovery, network maps, server agents and event correlation; an Enterprise edition adds support and features.

    Free plan Open source Self-hosted Infrastructure
  9. 9

    ntopng

    Web-based network traffic monitor that analyses packets or flows to show top talkers, applications, hosts and alerts. Open source Community edition with paid Pro and Enterprise versions.

    Free plan Open source (GPL-3.0) Self-hosted NetworkInfrastructure
  10. 10

    OpenNMS

    Network management platform for fault and performance monitoring at scale; Horizon is the open source edition and Meridian the supported one.

    Free plan Open source (AGPL-3.0) Self-hosted InfrastructureMetrics
  11. 11

    pmacct

    Set of passive network monitoring daemons that collect NetFlow, IPFIX, sFlow, BGP and BMP data and export traffic accounting to databases or message brokers.

    Free Open source (GPL-2.0) Self-hosted Network
  12. 12

    SmokePing

    Latency monitor that probes hosts continuously and graphs latency and packet loss distribution over time.

    Free Open source (GPL-2.0) Self-hosted InfrastructureMetrics
  13. 13

    Zabbix

    Open source monitoring for networks, servers, VMs, applications and cloud, using agents, SNMP and templates with trigger-based alerting; Zabbix Cloud is the hosted option.

    Free plan Open source (AGPL-3.0) Self-hosted InfrastructureMetricsDashboards

Side by side

Tool Pricing Free plan Open source Self-hosted SNMP pollingFlow analysisDevice discoveryTopology mapsLatency and pathBandwidth graphsSyslog and trapsConfiguration backupAlertingWireless
Akvorado Free Yes Yes Yes YesYes---Yes----
Cacti Free Yes Yes Yes YesYesYesYes-YesYesYesYes-
Checkmk Free plan Yes Yes Yes Yes-YesYes-YesYes-YesYes
Hubble Free Yes Yes Yes No-YesYesYes-NoNo-No
LibreNMS Free Yes Yes Yes YesYesYesYesYesYesYesYesYesYes
NetAlertX Free Yes Yes Yes Yes-Yes-----Yes-
Netdisco Free Yes Yes Yes Yes-YesYes------
NetXMS Free plan Yes Yes Yes Yes-YesYes--YesYesYes-
ntopng Free plan Yes Yes Yes YesYesYes-YesYesYes-Yes-
OpenNMS Free plan Yes Yes Yes YesYesYesYesYesYesYes-Yes-
pmacct Free Yes Yes Yes -Yes-No-No----
SmokePing Free Yes Yes Yes -No--Yes-NoNoYesNo
Zabbix Free plan Yes Yes Yes Yes-YesYesYesYesYes-Yes-

Yes: confirmed in the tool's documentation. No: documented as not offered. -: not confirmed. Plans and prices change; check each tool's own site before you decide.

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