Things like ECU monitors and the like, mostly. Also things like news/information clients, weather apps, etc.
I assume that one would have to do some custom work to integrate navit or monav (or any application) into this IVI system. As I understand it, these packages basically act as a compositor. Code providing the actual information and interfaces exists as separate applications. I was hoping some of those applications written with these base libraries in mind might be available as Free Software.