eIQnetworks, Inc. Analysis and Reporting of all leading firewalls, including Cisco PIX, NetScreen, CheckPoint, Nokia, WatchGuard, SonicWALL, Secure Computing, Symantec, Microsoft ISA server, Fortinet, etc. http://www.eiqnetworks.com
Employee Monitoring Solutions Offers network monitoring software for secretly recording emails, chats, websites, keystrokes, applications and much more for each PC in your network. Remotely monitoring and control each PC from one centralized location. http://www.employee-monitoring.com
esniff.c Source for a basic ethernet sniffer. Originally came from an article in Phrack, I think. http://firewall.com/software/ESniff.c
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