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.
Web ScrapBook - A browser extension that captures the web page faithfully with highly customizable configurations.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
Archivarix Website Downloader - Website online downloader and Content Management System (CMS) existing site converter.