SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
Web ScrapBook - A browser extension that captures the web page faithfully with highly customizable configurations.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Packet Sender - Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing.
Archivarix Website Downloader - Website online downloader and Content Management System (CMS) existing site converter.