I really would love this open source alternative to Siri/Cortana/Echo which is called Mycroft to work, it doesn't even have to be as good as the closed source alternatives. Sadly the, in my eyes most important, speech to text component is just an empty repo on Github https://github.com/MycroftAI/openstt

It doesn't say it on the website but I have been listening to a couple of podcasts where their CEO was on and when asked, he told them that they'll be using Google for that.

Don't get me wrong, there is a lot more to this system than speach to text, but if everything I am saying is going to a 3rd party server then the whole free software thing seems meaningless.