net-creds is a Python-based tool for sniffing plaintext passwords and hashes from a network interface or PCAP file – it doesn’t rely on port numbers for service identification and can concatenate fragmented packets.
It can sniff the following directly from a network interface or from a PCAP file:
There is also:
SniffPass – Simple Password Sniffer
You can download net-creds here:
Or read more here.
Read the Full Article here: >Darknet – The Darkside