Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Master Converter - Master Converter is really a powerful unit converter for the Windows operating systems users.
ioBroker - flexible and modular application for the IoT and Smarthome
Quick Conversion-LITE - Quick Conversion-LITE is really a simple to use unit converting application that offers its users with a multiple ways of converting different measurement units.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Byte Converter - As the name proposes, Byte Converter is a unit converting application that is capable of converting any unit of measurement to the micro level.