MIWIFI by Xiaomi - Wifi router beta with a twist: you build it yourself
Flashlight - Control your Mac with a keystroke.
Wifi Porter - Connect guests to your network quickly
Tiny Flashlight + LED - Tiny Flashlight + LED is free to use application that can be used anywhere else, having nicely built-in functionality.
Velop - Whole-home mesh Wi-Fi by Linksys
Screen Torch Advanced 2 - "Screen Torch Advanced 2", is an handy torch program. It only uses devices' backlight.