Acrylic WiFi is a free WiFi scanner designed to scan wireless networks and view WLAN channels, signal, traffic and security.

Kismet is a wireless network detector, sniffer, and intrusion detection system.

WiFi Analyzer can help you to identify Wi-Fi problems, find the best channel or the best place for your router/access-point.

Winhotspot is a free virtual WiFi router for windows.

inSSIDer by MetaGeek wifi analyzer.

NetStumbler (Network Stumbler) is a tool for Windows that facilitates detection of Wireless LANs using the 802.11b, 802.11a and 802.11g WLAN standards.

WiFi Explorer is a wireless network scanner tool for macOS that can help users identify channel conflicts, overlapping and network configuration issues that m…