Which of the following are well known password-cracking programs?

L0phtcrack (also known as LC5 or L0phtCrack) is a well-known historical and modern password auditing and recovery tool, particularly effective against Windows hashes.

NetCat is a versatile networking utility tool used for reading from and writing to network connections, primarily for network debugging and data transfer, not password cracking.

Netbus is a remote administration tool (RAT) or Trojan horse, primarily used for remote control and surveillance of compromised systems, not for cracking passwords.

John the Ripper is a popular open-source password cracker widely used by security professionals for auditing password strength and cracking various hash types.