Kon-Boot is described as 'Application which will silently bypass the authentication process of Windows based operating systems. Without overwriting your old password! In other words you can login to your Windows profile without knowing your password' and is an app in the security & privacy category. There are more than 10 alternatives to Kon-Boot for Windows, Linux, BSD and Haiku. The best Kon-Boot alternative is John the Ripper, which is both free and Open Source. Other great apps like Kon-Boot are Lazesoft Recovery Suite, ophcrack, Offline NT Password & Registry Editor and PassFab for PPT.