inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
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).
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Npcap - Npcap is the Nmap Project's packet sniffing library for Windows.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
WinPcap - Industry-standard tool for link-layer network access in Windows.