Ettercap - Ettercap is a suite for man in the middle attacks on LAN.

HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.

tcpdump - tcpdump is a common packet analyzer that runs under the command line.

SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.

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.

GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...