The ipsumdump program summarizes TCP/IP dump files into a self-describing ASCII format easily readable by humans and programs. Ipsumdump can read packets from network interfaces, from tcpdump files, and from existing ipsumdump files. It will transparently uncompress tcpdump or ipsumdump ...

The Network Dump data Displayer and Editor is a framework for inspection, analysis and manipulation of tcpdump trace files. It addresses the need for a toolset that allows easy inspection, modification, and creation of pcap/tcpdump trace files.

sipsak is a small command line tool for developers and administrators of Session Initiation Protocol (SIP) applications. It can be used for some simple tests on SIP applications and devices.

mtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool. As mtr starts, it investigates the network connection between the host mtr runs on and HOSTNAME by sending packets with purposefully low TTLs. It ...

LFT, short for Layer Four Traceroute, is a sort of 'traceroute' that often works much faster (than the commonly-used Van Jacobson method) and goes through many configurations of packet-filters (firewalls). More importantly, LFT implements numerous other features including AS number ...

RANCID monitors a router's (or more generally a device's) configuration, including software and hardware (cards, serial numbers, etc) and uses CVS or Subversion to maintain history of changes. Rancid currently supports Cisco routers, Juniper routers, Catalyst switches, Foundry switches, Redback ...

Web Developer is a nifty Firefox extension which provides some very handy tools for web developers, including CSS manipulation, object highlighting, code validation, browser resizing, and lots more.

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

packETH is a Linux GUI packet generator tool for Ethernet. It allows you to create and send any possible packet or sequence of packets on the Ethernet.

Kiwi CatTools automates configuration backups and management on routers, switches and firewalls. It provides e-mail notification and compare reports highlighting config changes. Supports Telnet, SSH, TFTP and SNMP.

A win32 with GUI version of [mtr](http://www.bitwizard.nl/mtr/), not quite as full featured but handy as a free and stand-alone tool.

WANem is a wide area network emulator. It supports various features such a bandwidth limitation, latency, packet loss, network disconnection among other wide area network characteristics.

OpenVAS stands for Open Vulnerability Assessment System and is a network security scanner with associated tools like a graphical user fontend. The core is a server component with a set of network vulnerability tests (NVTs) to detect security problems in ...

A semi-automated, largely passive web application security audit tool, optimized for an accurate and sensitive detection, and automatic annotation, of potential problems and security-relevant design patterns based on the observation of existing, user-initiated traffic in complex web 2.0 environments. Detects ...

iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "why is our ...

A Firefox plugin which allows you to view the HTTP headers of a live connection as they are sent and received.

mturoute.exe is a small command line application that uses ICMP pings of various sizes in order to determine the MTU values on the path between itself and the target system. It also includes a "traceroute" like mode where it will ...

XTest is a simple, practical, and free, wired 802.1x supplicant security tool implementing the RFC 3847 EAP-MD5 Authentication method. It can be used to assess the password strength within wired ethernet environments that rely on 802.1x to protect IP Phones ...

Helix is a customized distribution of the Knoppix Live Linux CD. Helix is more than just a bootable live CD. You can still boot into a customized Linux environment that includes customized linux kernels, excellent hardware detection and many applications ...

BGPlay is a Java application which displays animated graphs of the routing activity of a certain prefix within a specified time interval. Its graphical nature makes it much easier to understand how BGP updates affect the routing of a specific ...