Ness is the NonUI iOS internal application responsible for BurnIn testing in the Factory Environment, that is also known as "Earthbound". Not much is known about this app, and what it truly does. It is believed to be a reincarnation of the application "BurnIn". The app's icon is a remake of one of the characters from the Nintendo game, Earthbound. This app first made an appearance in an iOS 7 SwitchBoard build.
The UI of the application features two main elements. Firstly the main UI that shows a picture of the Earth, and if you pull down in the way that you would typically presented with the notification center in stock iOS you are presented with something that resembles "Control Center", it is currently unknown what these do. Finally when this "Control Center" is activated, you see a picture of the Nest Thermostat behind the centre. It is unknown why this occurs, but may have something to do with the temperature of the phone as there is also another file in the .app that references to the temperature of the Nest to be hot, and is thus named "internal_thermostat_hot".
The "Control Center".
This app is typically found under: /AppleInternal/Applications/SwitchBoard/Ness.app
The file structure of the app: