NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
Win10Pcap - Win10Pcap is a WinPcap-based Ethernet packet capture library.
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.
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.