Netcat
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 and exploration tool, since
it can create almost any kind of connection you would need and has
several interesting built-in capabilities.
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Ophcrack
Ophcrack is a Windows password cracker based on a time-memory
trade-off using rainbow tables. This is a new variant of Hellman's
original trade-off, with better performance. It recovers 99.9% of
alphanumeric passwords in seconds.
Download Ophcrack
Cain & Abel
Cain & Abel is a password recovery tool for Microsoft
operating systems. It allows easy recovery of various kind of
passwords by sniffing the network, cracking encrypted passwords
using Dictionary, Brute-Force and Cryptanalysis attacks, recording
VoIP conversations, decoding scrambled passwords, revealing
password boxes and analysing routing protocols.
Download Cain & Abel
Windows XP Service Pack 2
Windows XP Service Pack 2 is the latest service pack for Windows
XP -- Service Pack 2 (SP2) -- is all about security. It provides
better protection against viruses, hackers and worms, and includes
Windows Firewall, Pop-up Blocker for Internet Explorer and the new
Windows Security Center.
Download Windows XP Service Pack 2
John the Ripper
John the Ripper is a fast password cracker, currently available
for many flavors of Unix (eleven are officially supported, not
counting different architectures), DOS, Win32, BeOS, and OpenVMS.
Its primary purpose is to detect weak passwords. Besides several
crypt(3) password hash types most commonly found on various Unix
flavors, supported out of the box are Kerberos AFS and Windows NT,
2000, XP, 2003, LM hashes, plus several more with contributed
patches.
Download John the Ripper