Nuance is working, not so quietly it turns out, on a challenger to Siri and Google Now. Codenamed Project Wintermute, the voice recognition pioneer's latest effort focuses on building a cross-platform, cloud-based virtual assistant. Nuance VP Matt Revis told The Next Web, that the company "want[s] to be completely platform agnostic." Rather than locking people into Android or iOS, it wants people to be able to tap into Wintermute from any computer, handset or tablet. Even TVs are being targeted -- in o