Many of us must have heard of voice assistants like Alexa, Siri, Google Assistant, and Cortana. These voice assistants are based on voice recognition, NLP, and speech synthesis. Many of these open-source voice assistants have come into existence recently and will probably take some time to develop into a more sophisticated solution. But still, one can opt for any voice assistant depending upon the extent of the requirement.
Home Infographic Popular Open Source Voice Assistants List