ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
VoiceAttack - VoiceAttack will take commands that you speak into your microphone
Mycroft.AI - Mycroft is the world’s first open source assistant.
VoiceMacro - Control applications or games by voice commands and/or by the press of a keyboard, mouse button or...
Google Assistant - Get things done with Google Assistant
Rhasspy - Rhasspy transforms voice commands into JSON events that can trigger actions in home automation software.