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. Wireshark has a rich feature set which includes the following: * Deep inspection of hundreds of ...

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 ...

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 ...

Ettercap is a suite for man in the middle attacks on LAN. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols (even ciphered ones) ...

OpenSSH is a FREE version of the SSH connectivity tools that technical users of the Internet rely on. Users of telnet, rlogin, and ftp may not realize that their password is transmitted across the Internet unencrypted, but it is. OpenSSH ...

A very fast network logon cracker which support many different services. Currently this tool supports: TELNET, FTP, HTTP, HTTPS, HTTP-PROXY, SMB, SMBNT, MS-SQL, MYSQL, REXEC, RSH, RLOGIN, CVS, SNMP, SMTP-AUTH, SOCKS5, VNC, POP3, IMAP, NNTP, PCNFS, ICQ, SAP/R3, LDAP2, LDAP3, ...

NetStumbler is a tool for Windows that allows you to detect Wireless Local Area Networks (WLANs) using 802.11b, 802.11a and 802.11g. It can be used for locating access points, mapping wireless coverage, calibrating antennas, and much more. Its counterpart, MiniStumbler, ...

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, ...

This utility, which has the most comprehensive knowledge of auto-starting locations of any startup monitor, shows you what programs are configured to run during system bootup or login, and shows you the entries in the order Windows processes them. These ...

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 ...

Yersinia is a network tool designed to take advantage of some weakeness in different network protocols. It pretends to be a solid framework for analyzing and testing the deployed networks and systems. Currently, there are some network protocols implemented, but ...

VoIP Hopper is a GPLv3 licensed security tool, written in C, that rapidly runs a VLAN Hop into the Voice VLAN on specific Ethernet switches. VoIP Hopper does this by mimicking the behavior of an IP Phone, in both Cisco ...

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 ...

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, ...

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 ...

WhoB is a likable whois client designed to provide everything a network engineer needs to know about a routed IP address by typing one line and reading one line. But even so, it's worth typing a few more lines because ...

PktAnon performs network trace anonymization. It is highly configurable and uses anonymization profiles. Anonymization profiles allow for mapping of arbitrary anonymization primitives to protocol attributes, thus providing high flexibility and easy usability. A huge number of anonymization primitives and network ...

NTRadPing is a useful tool for testing installations of your RADIUS servers. Through NTRadPing you can simulate authentication and accounting requests and send them to the RADIUS server making NTRadPing act as a NAS client.

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 ...

Hackvertor is an online conversion tool which can serve as many tools to aide browser hacking, XSS testing, SQL injection, fuzzing, hashing, and lots more. Thanks to Gareth Heyes for suggesting this tool!