Mycroft.AI - Mycroft is the world’s first open source assistant.
Bixby - Advanced AI voice assistance for Samsung devices
Siri Shortcuts - Siri is an intelligent assistant that offers a faster, easier way to get things done on your Apple devices. Even before you ask.
kalliope - Kalliope is a modular always-on voice controlled personal assistant designed for home automation.
vokul - 100% Handsfree Voice Control App for iOS Devices - Siri Alternative
MindMeld - Intelligent Voice Interface powered by AI technologies and Natural Language Processing