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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.
ViewHTTPHeaders.com - View HTTP header response for any web page.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
HTTP Header Live - Displays the HTTP header. Edit it and send it.
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.