Can't interact with the world, can only observe. Used in the multiplayer waiting-to-respawn screen.
The controller controls a character. This is the default controller in freeplay.
The controller isn't tied to a character. This is the default controller in sandbox.
The Editor Controller near ultimate power to do almost anything in the game.
The player can't interact with the world, and the camera pans around in a predefined manner.
Can't change anything in the world but can view anything.
Can't move/change items but can build ghosts/change settings.