Please download it here A paper from Open Management Consortium
This is a paper from “2008 Ottawa Linux Symposium”. It will give you a nice insight about some great NSM projects. It is talking about OpenNMS, Zabix, Zenoss, GroundWorks and Hyperic, those might b the hottest projects around NMS field. If you are looking for a open source network and system monitoring solution, or you are testing one of them; you should check it out.