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NSClient++ is a monitoring agent for Windows developed by MySolutions NORDIC and available as free, open-source software. Its purpose is to enable remote monitoring of Windows systems by exposing system, performance, and event-log information to external monitoring platforms. Originally built for Nagios and Icinga, NSClient++, also known as NSCP, can now be used with most modern monitoring systems, placing it firmly in the system monitoring and infrastructure management software category. It supports communication through several well-established interfaces, including NRPE, NSCA, and NRDP, which are commonly associated with Nagios-style monitoring environments, as well as REST and Prometheus-compatible endpoints for integration with contemporary monitoring stacks. This range of supported protocols allows organizations to incorporate Windows hosts into both legacy and modern monitoring architectures. A typical use case involves a central monitoring server querying an NSClient++ agent installed on a Windows machine to retrieve data on resource utilization, service states, or log events, and to raise alerts when defined thresholds are exceeded. In addition to its built-in checks, the agent can execute external scripts written in PowerShell, Python, Lua, Visual Basic, and many other languages, enabling administrators to create custom checks tailored to specific applications, hardware, or business requirements. The software is distributed in version 0.19.0 as the current release, and a total of 26 versions are recorded in the catalog, indicating an active development history with multiple releases available for reference or deployment. NSClient++ is therefore suited for system administrators, IT operations teams, and managed service providers who need a simple, secure, and powerful agent to monitor Windows environments and integrate those systems into a unified monitoring solution across heterogeneous infrastructure.
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