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.
NetSpot - NetSpot is a free app for wireless site surveys, Wi-Fi analysis, and troubleshooting
SoftPerfect WiFi Guard - Security of your Wi-Fi network for Windows, macOS and Linux
Homedale - With Homedale you can search for Wi-Fi / WLAN Access Points and monitor their signal strength.