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
WinPcap - Industry-standard tool for link-layer network access in Windows.
Vistumbler - Vistumbler is a wireless network scanner for Windows Vista and Windows 7. Features:
Npcap - Npcap is the Nmap Project's packet sniffing library for Windows.
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.