Route4Me just lost functionality so Waze has an opportunity here... especially if you want to offer individuals a free plan but then sell to corporations a route optimization tool for their field reps/drivers.
I used that app for 5 years and was able to import an excel file with my client addresses, they now shut off that option for individuals and you can only access it from a corporate account.

Basically if I have 10 clients on excel I need to go to today, I want to be able to import that into Waze, and then Waze will "optimize" the route to give me an efficient driving plan based on the locations of each client.