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...

SEPIA Framework - SEPIA is a server-based, extendable, personal, intelligent assistant.

Braina - Braina (Brain Artificial) is an intelligent personal assistant software for Windows OS that allows you to interact with your computer using voice commands.

Rhasspy - Rhasspy transforms voice commands into JSON events that can trigger actions in home automation software.