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Windows-based tools 
-  WildPackets (formerly AGNetTools) EtherPeek plus iNetTools (DNS Lookup, Finger, Name Lookup, Name Scan, Ping, Ping Scan, Port Scan, Service Scan, Throughput, Trace Route and Whois)
 -  J. River Network Toolbox (ping, traceroute, IP address and port scanner, finger, whois, and more)
 -  eEye Digital Security's nmapNT
 -  cotse.com's winetd, an NT port of inetd, including tcpwrappers, honeypot modules, and more
 -  Foundstone's tools, including SuperScan port scanner, DDoS ping, and UDP flood
 -  NetBIOS tools
 -  Sysinternals Miscellaneous Tools
 -  NetScan Tools Pro, includes a wealth of tools all in one place
 -  GFI LANguard Network Security Scanner (N.S.S.), "allows you to scan, detect, assess and remediate any security vulnerabilities on your network" (Commercial and freeware versions available)
  Network-based tools 
 -  Google Hacking
  
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