This is the most common "good" use. If a company loses access to an encrypted legacy database or a user forgets their Windows login, a decryptor is the only way to recover that data.
These tools extract the "saved passwords" stored in Chrome, Firefox, or Edge. Since browsers often store these with weak local encryption, they are very easy to recover. password decryptor
Tools like John the Ripper or Hashcat are the industry standards for cracking Windows (NTLM) or Linux passwords. This is the most common "good" use
Ethical hackers use these tools to test the strength of a company’s security. If a tool can crack a company’s passwords in minutes, the security needs an upgrade. the security needs an upgrade.