Ettercap is a network sniffer/interceptor/logger for switched LANs. It uses ARP poisoning and the man-in-the-middle technique to sniff all the connections between two hosts. Features character injection in an established connection – you can inject characters to server (emulating commands) or to client (emulating replies) while maintaining the connection alive! Integrated into a easy-to-use and powerful ncurses interface.
You can download it from the following link: https://packetstormsecurity.com/files/download/24164/ettercap-0.1.0.beta.tar.gz
Source: https://packetstormsecurity.com/files/24164/ettercap-0.1.0.beta.tar.gz.html