Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Simple Flashlight - A clean flashlight with an extra bright display and customizable stroboscope.
ioBroker - flexible and modular application for the IoT and Smarthome
Tiny Flashlight + LED - Tiny Flashlight + LED is free to use application that can be used anywhere else, having nicely built-in functionality.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
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.