QuickMark - QuickMark makes everything possible.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.
ioBroker - flexible and modular application for the IoT and Smarthome
ZXing - Barcode Scanner for Android
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation