Free and open first
Best Server Monitoring in 2026
- 38 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
- 2
Checkmk
Free plan Open source AndroidAPIiPhone+5Checkmk offers broad infrastructure coverage and several monitoring methods, with a free Community option for smaller environments.
- 3
Glances
Free plan Open source AndroidAPILinux+4Glances covers a broad set of system metrics and offers several ways to monitor remotely or export statistics. Check its Python requirement and optional dependency setup against the features you need.
- 4
Netdata
Free plan Open source AndroidAPIiPhone+5Netdata combines infrastructure metrics, logs, alerts, and troubleshooting across cloud and on-premises deployment options.
- 5
Beszel
Free plan APILinuxMac+3 - 6
Canonical Landscape
Free plan APILinuxSelf-hosted+1Landscape combines Ubuntu fleet administration, monitoring, and several deployment options.
- 7
Icinga
Free plan APILinuxSelf-hosted+2Icinga offers self-hosted monitoring with a free edition and options for distributed setups, certificate monitoring, and integrations.
- 8
eZ Server Monitor
Free plan LinuxSelf-hostedWeb - 9
ManageEngine OpManager
Free plan AndroidAPIiPhone+4OpManager brings infrastructure metrics, traffic analysis, alerts, and troubleshooting into one self-hosted product.
- 10
Nagios XI
Free plan APILinuxMac+3Nagios XI offers self-hosted monitoring, a limited free edition, and perpetual paid licenses priced by node count.
- 11
Monit
Free plan LinuxMacSelf-hostedMonit combines system checks, alerts, and process actions in a free self-hosted utility for Linux and macOS.
- 12
Munin
Free plan APILinuxSelf-hostedChoose Munin if you want free, self-hosted resource monitoring with graphing, a broad plugin ecosystem, and configurable alerts.
- 13
Naemon
Free plan LinuxSelf-hostedWeb - 14
Nagios Core
Free plan APILinuxSelf-hosted - 15
NetXMS
Free plan AndroidAPILinux+4NetXMS combines discovery, topology maps, protocol support, and distributed monitoring in an open-source solution.
- 16
openITCOCKPIT
Free plan APIiPhoneLinux+4openITCOCKPIT covers a broad range of infrastructure and application monitoring, with dashboards, reporting, and integrations.
- 17
OpsDash
Free plan APILinuxSelf-hosted+2 - 18
Paessler PRTG Network Monitor
Free plan AndroidAPIiPhone+5PRTG combines on-premises infrastructure monitoring with alerts, reports, dashboards, and an API. Check sensor needs and the single-license-per-server limit when choosing a plan.
- 19
Monitorix
Free plan LinuxSelf-hostedChoose Monitorix if you want a free, self-hosted tool for server, service, and hardware monitoring, with multihost graphs and configurable history.
- 20
Performance Co-Pilot
Free plan APILinuxMac+2Choose PCP if you need a free, self-hosted toolkit for collecting and analyzing performance data across multiple hosts.
- 21
Prometheus
Free plan LinuxMacSelf-hosted+2Prometheus provides a free monitoring and alerting toolkit with flexible metric collection and querying. Its stated accuracy limitation makes it unsuitable for per-request billing workloads.
- 22
Sensu Go
Free plan APILinuxMac+3Sensu Go combines event processing, infrastructure discovery, alerting, and remediation in a self-hosted monitoring product.
- 23
Site24x7 Server Monitoring
Free plan AndroidAPIiPhone+4Site24x7 Server Monitoring brings server metrics, agent and agentless monitoring, and integrations into one platform.
- 24
Watchflare
Free plan LinuxMacSelf-hosted+1Watchflare combines host monitoring, package inventory, and configurable alerts in a self-hosted system.
- 25
WhatsUp Gold
Free plan APISelf-hostedWeb+1WhatsUp Gold brings network mapping, device and application monitoring, traffic analysis and alerts into one product.
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price