John the Ripper is an Open Source password security auditing and password recovery tool available for many operating systems including Windows.
John the Ripper jumbo supports hundreds of hash and cypher types, including for user passwords of Unix flavours (Linux, *BSD, Solaris, AIX, QNX, etc.), macOS, Windows, 'web apps' (e.g., WordPress), groupware (e.g., Notes/Domino), and database servers (SQL, LDAP, etc.); network traffic captures (Windows network authentication, WiFi WPA-PSK, etc.); encrypted private keys (SSH, GnuPG, cryptocurrency wallets, etc.), filesystems and disks (macOS .dmg files and 'sparse bundles', Windows BitLocker, etc.), archives (ZIP, RAR, 7z), and document files (PDF, Microsoft Office's, etc.).
John the Ripper password cracker is free and Open Source software, distributed primarily in source code form.
Professionals use John the Ripper for testing password strength. This tool can quickly look for complex ciphers, encrypted logins, and hash-type passwords and identify weak passwords, which can be a big threat to a protected system. The software can efficiently work with Windows, DOS, OpenVMS systems, and Unix environments.