SniffPass

SniffPass is a small, free program that allows you to monitor traffic on a wireless network so you obtain passwords and access keys that have been used on that network.

It can be especially useful for network administrators, as the program works with POP3, IMAP4, SMTP, FTP, and HTTP protocols, and can help you recover web, FTP, or email passwords that users have forgotten.

You can find a list of detailed information of all the passwords that have been recovered on the SniffPass interface, from the type of protocol used to the origen and destination IPs, the user, and the password in question.