NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
SelfishNet - Block anyone or any device from using your internet
inSSIDer - inSSIDer Essential makes it easy to maintain small business WiFi.
Wifi Router Manager - Wifi Router Manager is a free-to-use network tool application that is providing the complete visibility of your wifi network from signal strength, security to IP addresses.
Kismet - Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system.
SoftPerfect WiFi Guard - Security of your Wi-Fi network for Windows, macOS and Linux