Personally, I'm using
$1. It's free and open source, and works with Firefox, Chrome, and Internet Explorer for web browsing.
I also use an IPhone with VoiceOver turned on for browsing while on the go. Though I tend not to use it while actually moving, because I need to pay attention to where I'm going.
And the small ducks would win by a landslide. How fat and lazy does a duck have to get to be a tonne? Could it even walk anymore? It'd just be countless normal ducks nibbling away at a quacking mound of fat.