Floppyfw is a router and firewall on one floppy disk. It uses Linux basic firewall capabilities, and has a simple packaging system. It is ideal for masquerading and securing networks on ADSL and cable lines, using static IP, DHCP, and PPPoE. Installation involves editing of only one file on the floppy.
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VisualRoute is a traceroute tool which displays a map of the path to the destination server by looking up the geographical location of each traceroute hop. The network service provider is identified for each hop, and instant domain and network whois information enable quick problem or abuse reporting.
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Ethereal is a GTK+-based network protocol analyzer, or sniffer, that lets you capture and interactively browse the contents of network frames. The goal of the project is to create a commercial-quality analyzer for Unix and to give Ethereal features that are missing from closed-source sniffers. Screenshot available here.
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