VoiceAttack - VoiceAttack will take commands that you speak into your microphone
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
VoiceMacro - Control applications or games by voice commands and/or by the press of a keyboard, mouse button or...
ioBroker - flexible and modular application for the IoT and Smarthome
Braina - Braina (Brain Artificial) is an intelligent personal assistant software for Windows OS that allows you to interact with your computer using voice commands.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation