tcpdump - tcpdump is a common packet analyzer that runs under the command line.
CrackStation - CrackStation is a web-based service that is used for retrieving passwords by cracking their hashes.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
MDCrack - MDcrack is a an aggressive cracker for MD2 MD4 MD5 HMAC-MD4 HMAC-MD5 NTLM PIX IOS APACHE FREEBSD IPB2 CRC32 CRC32B ADLER32 hashes
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
Password Cracker - Password Cracker is a software for Windows that is used for recovering forgotten passwords for different software and websites that you use from the browser.