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AirProbe is the new home of the former GSM-Sniffer project. The goal is to build an air-interface analysis tool for the GSM (and possible later 3G) mobile phone standard. The prime motivation is to learn the details of the technology, help people who develop other open GSM technology (like OpenBTS, OpenMoko?, BS11/OpenBSC and others) and […]

SQL Power Injector is an application created in .Net 1.1 that helps the penetration tester to find and exploit SQL injections on a web page.
For now it is SQL Server, Oracle, MySQL, Sybase/Adaptive Server and DB2 compliant, but it is possible to use it with any existing DBMS when using the inline injection (Normal mode). […]

WepAttack is a WLAN open source Linux tool for breaking 802.11 WEP keys. This tool is based on an active dictionary attack that tests millions of words to find the right key. Only one packet is required to start an attack.
The  requirements:
The network data has been captured by a WLAN card in monitor mode. A […]

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, decloaking) hidden networks, and infering […]

SPIKE When you need to analyze a new network protocol for buffer overflows or similar weaknesses, the SPIKE is the tool of choice for professionals. While it requires a strong knowledge of C to use, it produces results second to none in the field. SPIKE is available for the Linux platform only.
SPIKE […]

oSpy is a tool which aids in reverse-engineering software running on the Windows platform.
With the amount of proprietary systems that exist today (synchronization protocols, instant messaging, etc.), the amount of work required to keep up when developing interoperable solutions will quickly become a big burden when limited to traditional techniques. However, when the sniffing […]

Cheops-ng is a Network management tool for mapping and monitoring your network. It has host/network discovery functionality as well as OS detection of hosts. Cheops-ng has the ability to probe hosts to see what services they are running. On some services, cheops-ng is actually able to see what program is running for a service and […]

ScanLine is a command-line port scanner for all Windows platforms. It can perform traditional ICMP "pinging", optional additional ICMP TimeStamp scanning, can show host response times and number of hops, do TCP scanning, simple UDP scanning, banner grabbing and hostname resolving. Scanning is […]

strobe is a network/security tool that locates and describes all listening tcp ports on a (remote) host or on many hosts in a bandwidth utilisation maximising, and process resource minimizing manner. strobe approximates a parallel finite state machine internally. In non-linear multi-host mode it attempts to apportion bandwidth and sockets amoung the hosts very efficiently. […]

dsniff is a collection of tools for network auditing and penetration testing. dsniff, filesnarf, mailsnarf, msgsnarf, urlsnarf, and webspy passively monitor a network for interesting data (passwords, e-mail, files, etc.). arpspoof, dnsspoof, and macof facilitate the interception of network traffic normally unavailable to an attacker (e.g, due to layer-2 switching). sshmitm and webmitm implement active […]

Metasploit provides useful information to people who perform penetration testing, IDS signature development, and exploit research. This project was created to provide information on exploit techniques and to create a useful resource for exploit developers and security professionals. The tools and information on this site are provided for legal security research and testing purposes only. […]

Nirsoft website provides a number of utilities for password recovery, networking and other internet related tools.
For password recovery, there are

Mail PassView - Recover the passwords of popular email clients: Outlook Express, MS Outlook, Eudora, Mozilla Thunderbird , and more…
MessenPass - Recover the passwords of instant messenger programs: Yahoo Messenger, MSN Messenger, Trillian, and more… […]

Netifera is a new modular open source platform for creating network security tools. It provides many advantages for both security developers and researchers who want to implement new tools as well as the community of users of these tools.
Tools

Full IPv6 support
TCP and UDP network scanning
Service detection
Operating system identification
Reverse DNS scanning
DNS name brute forcing
DNS zone […]

Download Source Code
The requirement - I have an application which is installed in the customer machine. This application will generate log file which I need in case I need to do debugging. I do not want the customer to view the content of the log file and mess around with it.
To do this, I […]

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Several years back I was programming a network utility that needs an index relating IP network numbers to network names and identities, for class A, B and C networks, I found this list compiled from the Internet.
I know that you can always use whois, or some online website to achieve the same thing. MaxMind even […]