eero - Blanket your home in fast, reliable WiFi
Flashlight - Control your Mac with a keystroke.
EdgeWise Connect - Stay connected, even at the edge of Wi-Fi
Tiny Flashlight + LED - Tiny Flashlight + LED is free to use application that can be used anywhere else, having nicely built-in functionality.
Orbi WiFi System - Better WiFi. Everywhere.
Screen Torch Advanced 2 - "Screen Torch Advanced 2", is an handy torch program. It only uses devices' backlight.