MonitorMagic - Server & Network Monitoring 

Pro-active hardware, operating system, application and SNMP monitoring and alerting software for Windows Server systems.
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ActiveXperts Network Monitor 

ActiveXperts Network Monitor is the leading solution for monitoring all aspects of your LAN and WAN servers, workstations and devices. ActiveXperts Network Monitor supports Windows platforms, UNIX platforms, Linux platforms, and Novell platforms.
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