TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
TCP Optimizer - SpeedGuide.net - The Broadband Guide. Cable modems, DSL, Wireless, Network security. Free speed tweaks and TCP/IP tools for optimizing system performance.
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
Technitium MAC Address Changer - Technitium MAC Address Changer (TMAC) is a freeware utility to instantly change or spoof MAC Address of any network card (NIC).
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.
Netactview - Graphical network connections viewer for linux