CommView 

CommView is a program for monitoring Internet and Local Area Network (LAN) activity capable of capturing and analyzing network packets. With CommView you can see the list of network connections and vital IP statistics and examine individual packets.
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SystemView 

Network Monitoring, Send Message, Shutdown manager, Process manager, Reports, Remote Desktop Management, Inventory Management, Internet History, File History, Security management.Agentless management works both on workgroup and domain
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ServiceKeeper 

Administration, Monitoring and Recovery of any networked resources (Windows Services, TCP/IP Services, web servers, routers, file systems, Process memory and CPU usage, Event Log, ...) and notifcation in case of downtime (email, SMS, phone call, ...)
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MultiPing 

MultiPing is an application built for monitoring graphically one or more TCP/IP hosts, while providing detailed historical information about the collection period to monitor uptime and performance or to just keep track of general connectivity.
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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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Network Spy 

An Ethernet packet capture program. It decodes and analyzes IP packets on your LAN. It also lets you measure network load, resolve IP conflicts and build an ARP table. A powerful rules-based filtering engine enables you to perform intrusion detection
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