Armory
ShowIP 
(1 rating)
Firefox plugin by Jan Dittmer. Shows the IP address of the current page in the status bar. It also allows querying custom services by IP (right mouse button) and Hostname (left mouse button), like whois, netcraft. Additionally you can copy the IP address to the clipboard. This extension was formerly ...
Tamper Data (1 rating)
Firefox plugin by Adam Judson. Use Tamper Data to view and modify HTTP/HTTPS headers and post parameters, trace and time http response/requests, and security test web applications by modifying POST parameters.
Firebug (1 rating)
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.
wget (1 rating)
GNU Wget is a free software package for retrieving files using HTTP, HTTPS and FTP, the most widely-used Internet protocols. It is a non-interactive commandline tool, so it may easily be called from scripts, cron jobs, terminals without X-Windows support, etc. GNU Wget has many features to make retrieving large ...
Metasploit Framework (3 ratings)
The Metasploit Framework is a development platform for creating security tools and exploits. The framework is used by network security professionals to perform penetration tests, system administrators to verify patch installations, product vendors to perform regression testing, and security researchers world-wide. The framework is written in the Ruby programming language ...
Observium (1 rating)
Observium is an auto-discovering PHP/MySQL based network monitoring system focused primarily on Cisco and Linux networks but includes support for a wide range of network hardware and operating systems. Observium has grown out of a lack of easy to use NMSes. It is intended to provide a more navigable interface ...
Ostinato (1 rating)
Ostinato is an open-source network packet and traffic generator and analyzer with a friendly GUI. It aims to be "Wireshark in Reverse" and become complementary to Wireshark. It features custom packet crafting with editing of any field for several protocols: Ethernet, 802.3, LLC SNAP, VLAN (with Q-in-Q), ARP, IPv4, IPv6, ...
Nessus (2 ratings)
The Nessus vulnerability scanner, is the world-leader in active scanners, featuring high speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture. Nessus scanners can be distributed throughout an entire enterprise, inside DMZs, and across physically separate networks. When Nessus is managed with Tenable's ...
netcat (3 ratings)
Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol. It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging ...
Snort (1 rating)
Snort is an open source network intrusion prevention and detection system utilizing a rule-driven language, which combines the benefits of signature, protocol and anomaly based inspection methods. With millions of downloads to date, Snort is the most widely deployed intrusion detection and prevention technology worldwide and has become the de ...
RANCID (1 rating)
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 NASs, ADC EZT3 muxes, MRTd (and thus likely IRRd), Alteon ...
Scapy (4 ratings)
Scapy is a powerful interactive packet manipulation program. It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. It can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks ...
VMware Workstation 
(4 ratings)
VMware Workstation is a virtual machine software suite for x86 and x86-64 computers from VMware, previously a division of EMC Corporation. This software suite allows users to set up multiple x86 and x86-64 virtual computers and to use one or more of these virtual machines simultaneously with the hosting operating ...
Nagios (4 ratings)
Nagios is a host and service monitor designed to inform you of network problems before your clients, end-users or managers do. It has been designed to run under the Linux operating system, but works fine under most *NIX variants as well. The monitoring daemon runs intermittent checks on hosts and ...
Cacti (6 ratings)
Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use ...
SolarWinds Orion (5 ratings)
Orion is a commercial network management system produced by SolarWinds. It is capable of syslog, SNMP, NetFlow, and other types of monitoring. Additionally, it can be expanded with purchasable modules.
Dynagen (2 ratings)
Dynagen is a front-end for use with the [Dynamips](/armory/dynamips/) Cisco router emulator. It uses an INI-like configuration file to provision Dynamips emulator networks. It takes care of specifying the right port adapters, generating and matching up those pesky NIO descriptors, specifying bridges, frame-relay, ATM switches, etc. It also provides a ...
dynamips (2 ratings)
Dynamips is able to emulate Cisco hardware by running an unmodified IOS image on commodity PC hardware. Cisco 2600, 3600, 3700, and 7200 series routers are supported, as well some generic virtual devices like frame relay and Ethernet switches. Dynamips is developed by Christophe Fillot. A front end like [Dynagen](/armory/dynagen/) ...
Wireshark 
(14 ratings)
Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.
PuTTY (11 ratings)
PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham.
nmap (3 ratings)
Nmap ("Network Mapper") is a free and open source utility for network exploration or security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to ...
ratproxy (1 rating)
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 and prioritizes broad classes of security problems, such as dynamic ...
GNS3 (3 ratings)
GNS3 is a graphical network simulator that allows you to design complex network topologies and to launch simulations on them. To allow complete simulations, GNS3 is strongly linked with [Dynamips](/armory/dynamips/), an IOS emulator which allows users to run IOS binary images from Cisco Systems, and [Dynagen](/armory/dynagen/), a text-based front-end for ...
Kismet (1 rating)
Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic. Kismet identifies networks by passively collecting packets and detecting standard named networks, detecting (and given time, ...
iperf (1 rating)
Iperf was developed by NLANR/DAST as a modern alternative for measuring maximum TCP and UDP bandwidth performance. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss.
Angry IP Scanner (1 rating)
Angry IP Scanner is an open-source and cross-platform network scanner designed to be fast and simple to use. It scans IP addresses and ports as well as has many other features. It is widely used by network administrators and just curious users around the world, including large and small enterprises, ...
EtherApe (1 rating)
EtherApe is a graphical network monitor for Unix modeled after etherman. Featuring link layer, IP and TCP modes, it displays network activity graphically. Hosts and links change in size with traffic. Color coded protocols display. It supports Ethernet, FDDI, Token Ring, ISDN, PPP and SLIP devices. It can filter traffic ...
Burp Suite
Burp Suite is an integrated platform for attacking web applications. It contains all of the Burp tools with numerous interfaces between them designed to facilitate and speed up the process of attacking an application. All tools share the same robust framework for handling HTTP requests, authentication, downstream proxies, logging, alerting ...
Xprobe2
Written and maintained by Fyodor Yarochkin, Meder Kydyraliev and Ofir Arkin, Xprobe (I & II) is an active OS fingerprinting tools based on Ofir Arkins ICMP Usage In Scanning Research project.Xprobe is an alternative to some tools which are heavily dependent upon the usage of the TCP protocol for remote ...
lsof
lsof is a Unix-specific diagnostic tool. Its name stands for LiSt Open Files, and it does just that. It lists information about any files that are open by processes currently running on the system. It can also list communications open by each process.