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jVMonitor is a Java application which uses the VMware Infrastructure (vSphere) Java API (http://vijava.sourceforge.net) to monitor the status of a VMware vSphere Infrastructure (from version 4.0 and above). It is able to check the virtual machines, hosts and datastores status and if an alarm occurs, it can be notified through a mail or a syslog message.
RoofTop is a network/systems monitoring (NSM) tool that leverages SNMP standards to deliver critical health and performance monitoring through device based reports and graphs, event notifications, alerts, and configurable alarm thresholds.