Fast File Transfer - Fast File Transfer is an application with which you can transfer and receive files from one device to another with ease.

Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.

Immediate Contact Transfer - Immediate Contact Transfer app is an app by CyberValue that comes up with features to help you in using app-to-app sharing features to send and receive contacts between two mobile phones.

ioBroker - flexible and modular application for the IoT and Smarthome

Sweech - Sweech is a file transferring application that enables you to transport your data from a smartphone to a computer, tablet, and other mobile devices using WiFi.

openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation