The best free alternative to Kon-Boot is John the Ripper, which is also Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Kon-Boot and six of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Kon-Boot are Lazesoft Recovery Suite, ophcrack, Offline NT Password & Registry Editor and Trinity Rescue Kit.
John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix systems, supported...
Lazesoft Recovery Suite is a very easy to use ALL-IN-ONE boot disk that repair your crashed Windows, recover data from deleted, formatted, damaged partition, clone or backup disk, reset your forgotten Windows password.
Ophcrack is a Windows Password cracker based on Rainbow Tables.
Features
Cracks LM and NTLM Windows hashes Free tables available for Windows XP, Vista and 7 Brute-force module for simple passwords Audit mode and CSV export Real-time graphs to analyze the pas.
Windows stores its user information, including crypted versions of the passwords, in a file called 'sam', usually found in \windows\system32\config. This file is a part of the registry, in a binary format previously undocumented, and not easily accessible.
Trinity Rescue Kit or TRK is a free live Linux distribution that aims specifically at recovery and repair operations on Windows machines, but is equally usable for Linux recovery issues. Since version 3.
Forgot the Administrator's Password? PCLoginNow will help with forgot passwords in Windows NT, Windows 2000, Windows XP, and Windows 2003. You can Reset or Recover Windows NT/2000/XP/2003/Vista Administrator Password with PCLoginNow.
Russia
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John the Ripper is a password cracker where Kon-Boot bypasses the login password all together.