Ping Scanner Pro 

Ping Scanner Pro has 18 network tools, it can ping one address a lot of times or a lot of addresses one time. It will also tell you what MAC addresses are on your subnet, and perform DNS lookup or reverse DNS lookup. It does Traceroute, Whois.
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Techfacts XP 

Techfacts XP lets you examine, diagnose, monitor and troubleshoot Windows and your system. Gather detailed data on every aspect of your system and Windows. Supports Windows 98, ME, NT, 2K and XP. Gives you the data Microsoft tools do not.
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NetworkView 

NetworkView is a compact network discovery and management tool for the Win32 platform : in a few minutes, it will discover all TCP/IP nodes and draw a full graphical map using DNS, MAC addresses, SNMP, WMI, NetBIOS and TCP Ports information.
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GFI LANguard Network Security Scanner 

Security Vulnerability scanning and fixing with award-winning GFI LANguard Network Scanner - Download your free evaluation version today.
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EventTracker 

Consolidate and correlate event log information from Windows, Unix, Linux and SNMP devices to a central console so that alerts and reports can be generated, in accordance with user defined policy
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Essential NetTools 

Essential NetTools is a useful tool for diagnosing networks and monitoring your computer's network connections. It's a Swiss Army knife for everyone interested in a set of powerful network tools for everyday use.
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