inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Komodia Relay - Free open source tool to perform TCP based session relay