Etherdump Etherdump is a vanilla DOS Ethernet sniffer. Dumps all frames to a file. Filtering is not supported, unfortunately. http://firewall.com/software/etherdump103.zip
Etherload Etherload is a utility for measuring performance and other characteristics of Ethernets, such as packet origination via the MAC address. http://firewall.com/software/etherload103.zip
Firewall Builder Firewall Builder is multi-platform object oriented firewall configuration and management tool. It consists of a GUI and set of policy compilers for iptables, ipfilter, pf and Cisco PIX. http://www.fwbuilder.org/
fping Like Unix ping(1), but allows efficient pinging of a large list of hosts. V2.2. http://firewall.com/software/fping-2.2b1.tar.gz
GFI LANguard Network Security Scanner LANguard Network Security Scanner (LNSS) is a freeware tool to audit network security and proactively secure it. LNSS scans entire networks from a 'hacker's' perspective, and analyses machines for open ports, shares, security alerts/vulnerabilities, service pack level, installed hotfixes and other NETBIOS information such as hostname, logged on user name, users etc. It does OS detection, password strength testing and detects registry issues. http://www.gfi.com/lannetscan/index.htm
hide.c Code to exploit a world-writeable /etc/utmp and allow the user to modify it interactively. http://firewall.com/software/hide.c
ICMPinfo (V1.10) ICMPinfo is a tool for looking at the ICMP messages received on the running host. http://firewall.com/software/icmpinfo-1.10.tar.gz
ID-Synch User Provisioning Software ID-Synch creates, updates and deletes login IDs based on input from an authorization workflow engine, central user administration console or rules-based provisioning system. http://idsynch.com/
identd.c A modified identd that tests for the queue-file bug which is present in Sendmail versions earlier than 8.6.10 and possibly some versions of 5.x. http://firewall.com/software/identd.c
ISS - Internet Security Scanner ISS allows you to audit the security on your network. It used to be public domain, but I believe its now a commercial package. http://www.iss.net/