WinWedge - Data collection software for serial devices, including meters, balances, scales or any RS232...
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
TWedge - TWedge enables you to capture data from devices like bar code readers, scanners, decoders, gauges...
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
NoFlo - NoFlo is a JavaScript implementation of Flow-Based Programming (FBP).
ioBroker - flexible and modular application for the IoT and Smarthome