If you are interested in a 100% offline and private-by-design Voice AI, you should take a look at what we are building at https://snips.ai, it is 100% free for Makers
This allows you to do a 100% private Home Assistant, or add voice control to any of your projects :)
It works for english, french, german, japanese, spanish, italian, and more coming, and runs on a Raspberry Pi 3 (and iOS, Android, Linux)
You can take a look at our blog to see how to get started https://blog.snips.ai
We would love to publish on it what you are building with it!