TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
TCP Optimizer - SpeedGuide.net - The Broadband Guide. Cable modems, DSL, Wireless, Network security. Free speed tweaks and TCP/IP tools for optimizing system performance.
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.