Password hash cracking with John the Ripper (CPU) and Hashcat (GPU).
john --wordlist=rockyou.txt --format=md5crypt hashes.txt
john --show hashes.txt
hashcat -a 0 -m 0 hashes.txt rockyou.txt # MD5 dictionary
hashcat -a 3 -m 1000 hash.txt ?u?l?l?l?d?d?d # NTLM brute