NagCore4Win is a Nagios® Core implementation for Windows systems. It is a packaging of Nagios Core and many other related tools to make it a complete and ready-to-use solution for system monitoring. You can use NagCore4Win to monitor your IT-infrastructure Nagios-way from Windows.  

Nagios ® Core  is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes. Nagios® Core monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. In the event of a failure, Nagios® Core can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users, or customers. Cygwin is a Linux-like environment for Windows. It consists of a DLL (cygwin1.dll), which emulates substantial Linux API functionality, and a collection of tools. Following tools are also a part of Nagwin: Lighttpd, Php, Net-SNMPand Blat.