Tile - Track your lost items
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Clap To Find My Phone - Clap To Find My Phone is a free-to-use app through which you can precisely discover your cell phones and tablets just by clapping.
ioBroker - flexible and modular application for the IoT and Smarthome
Tile Sticker - The small Bluetooth tracker that sticks to anything
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation