A free program for Android, by voiceapp.

Sirius – voice assistant is a virtual assistant application that helps you to have quick and easy communication with your smartphone. If you want to know what’s going on or have a question about anything, just open the application and start chatting with Sirius. He will answer your question in a short time. Sirius is a very intelligent chatbot and works based on artificial intelligence. So, you will get an answer that is not the same as in other applications. All you need is to be connected to a network.