Tiny Flashlight + LED - Tiny Flashlight + LED is free to use application that can be used anywhere else, having nicely built-in functionality.
MIWIFI by Xiaomi - Wifi router beta with a twist: you build it yourself
Simple Flashlight - A clean flashlight with an extra bright display and customizable stroboscope.
Wifi Porter - Connect guests to your network quickly
Task Killer - Task Killer is an application which automatically forces other applications to stop which are running in the background, making you enhance your smartphone performance and battery life.
Velop - Whole-home mesh Wi-Fi by Linksys