Tiramisu - A Real-time Bus Tracker made by developers at Carnegie Mellon University
The Human-Computer Interaction Institute at Carnegie Mellon University developed and is continuing to research an app called Tiramisu (which literally means "pick me up" in Italian.) The app is for community members to track buses in real time and provide information about the fullness of a bus. The app requires your GPS or Wifi for accurate locations. Also, it can be used by the blind community.
Android: http://goo.gl/JGY57X | iPhone: http://goo.gl/eyK89x