If you would like to use a Microsoft Windows system for Simple Network Management Protocol (SNMP) or Windows Management Instrumentation (WMI) monitoring of systems, Paessler AG provides a free edition of their PRTG Network Monitor software, that provides a lot of capabilities, though there is a limit of 10-20 sensors with the free version (you can increase the default limit from 10 to 20 by putting a small banner for the program on your website). But for small businesses or personal use, that may provide all of the monitoring capability you need.
The company also provides other free SNMP and network tools at Free network tools for system administrators
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