Android, iOS and Windows all have their own voice powered assistants. They can help you carry out tasks, look up information and change settings by removing a number of steps.
Hound by SoundHound seems to be a voice powered assistant on steroids. It's not out yet but by the looks of it, it is much faster and more powerful than the likes of Siri or Google Now.
The video below shows what you can do with Hound.
But the video you'll really want to watch is this one. In this (potato quality) video, you can see Hound being used by it's founder and CEO. It's ridiculously fast and can respond to very detailed questions that other voice powered assistants would struggle with.