Alchemy Network Monitor 

Alchemy Network Monitor monitors your network servers and business-critical applications availability and performance and immediately alerts you if a server gets out of order.
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sMonitor 

Monitors networked devices and TCP/IP services running on them. Allows to ping hosts and check TCP and UDP ports. Shows a current status, sends notifications by email, generates log, HTML and CSV files and executes custom scripts. Run as NT service.
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ServerSweep Professional 

ServerSweep Professional has been designed from the ground up by experienced Microsoft Windows NT / 2000 Server support engineers and consultants to provide the very best in Microsoft Server Monitoring.
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ShareAlarmPro 

ShareAlarmPro monitoring network access to shared folders and resources, allows to see parameters of the workstation which tries to establish a connection with your computer.The remote workstation, user, path, OS, permissions of the accessed folder.
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IPSentry Network Monitoring Suite 

Use this software to monitor your network servers and devices 24 hours a day, ensuring that your e-mail servers, Web sites, FTP servers, news servers, routers, and other devices and services are active and responding.
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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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