Another entrant, Jolla, says its 'Sailfish' platform is a second-generation operating system like BlackBerry's BB10 and is easytouse because it has a gesture-based userinterface and is designed to avoid patent litigation.
Similarly, while Apple's OS X's userinterface is not just easytouse but engaging, it's just a candy shell built around the kind of tried-and-true Unix software that's powered everything from phone networks to computer science labs for a generation.