GFI Network Server Monitor 

Checks your network & servers for failures and fixes them automatically, before your network users notice them! Alerts can be sent by email, pager or SMS. You can reboot a machine, restart a service or run a script, batch job or executable.
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IT Monitor 

IT Monitor is the leading solution for monitoring every aspect of your LAN and WAN network. It proactively manages your network servers, printers, network devices, databases and applications.
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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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