When will FaceTime be available for other Platforms?

When will FaceTime be available for other Platforms? Steve Jobs, the CEO of the company at the time, said Apple was working on making FaceTime an Open standard.

With already so many FaceTime enabled devices out there, and with so many financially strapped individuals relying on the cheaper android devices for both their phone and there Internet, opening up FaceTime to all other platforms will make facetime the default videoconference utility. I want to see this implemented for medical calls to nurses and providers in helping them to assess patients from a distance that are unable to travel. Visual/live communication would be a breakthrough.

This can already be implemented with patients who have a iOS devices, or trying to get them to download app that other devices can use....but it is not as seamless as FaceTime. When will this promis be fulfilled?