Web based tools:

network-tools.com (Traceroute, Ping, DNS Lookup, Whois, etc.)
All the world's traceroute servers
the Multi-Router Traffic Grapher (MRTG)

Unix tools:

Ethereal Network Analyzer
NMAP -- The Network Mapper
The Nessus open source security scanner
Snort: The Open Source Network Intrusion Detection System
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