Server and network monitoring: Checkmk Community, Xitoring Agent, PA Server Monitor Free and Open-AudIT inventory.
Free, open-source (GPL-2.0) infrastructure monitoring, formerly called Checkmk Raw Edition. Runs on Linux, Docker or a virtual appliance and monitors Windows, Linux, Unix and network devices with auto-discovery and rule-based configuration on a Nagios core.
Xitogent is the lightweight agent that sends server metrics, service checks and integration data from Linux and Windows Server to the hosted Xitoring monitoring service. Free to install, but the service is paid: shareware (conditionally free).
The Free edition of Power Admin’s PA Server Monitor watches Windows event logs, pings devices and checks web pages, for one server or up to ten monitors. Disk, CPU, service and SNMP monitoring need a paid edition. Windows only.
Open-AudIT by FirstWave discovers devices with Nmap and audits hardware, software and configuration over SNMP, WMI and SSH, without agents. The Free edition covers up to 100 devices at no cost; paid editions add scheduling, dashboards and vulnerability reporting.
