GFI Network Server Monitor
have one of the best functional, but missing map. Dude have one of the best map, but functional is limited.
There presented in templates for the most frequent inspections, no need to reinvent the wheel for such inspections. scripts is good for non-standard situations
check disk space - one of the most common tests, but it needs to reinvent the entire script and they are not universal
If it happened in the Dude to realize at least part of functional NSM, this would be a pretty good product.