inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
Starry - A touchscreen Wi-Fi router and radical Internet service
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
eero - Blanket your home in fast, reliable WiFi
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.
WiFi Map - A crowdsourced list of routers and passwords