"I have to choose my words carefully," says Joe Castelino of Stevens Creek Volkswagen in San Jose, California, when asked about the management software on which most car dealerships rely for inventory information, marketing, customer relationships and more.

Castelino, the dealership's service director, laughs as he says this. But the joke has apparently been on car dealers, most of whom have largely relied on a few frustratingly antiquated vendors for their dealer management systems over the years -- along with many more sophisticated point solutions.