DeOns is a mobile app built for iOS and Android that shows the bus estimate time of arrival, bus stops information (nearest bus stop, which lines stop in this bus stop, etc), bus lines info (itinerary, schedule, etc) as well as find the best route using public transportation.
Since most of the buses don't have a GPS DeOns uses a crowdsourcing system to track buses. When a user is in a bus he starts to send his location this way DeOns can predict the ETA for other users waiting this bus. Initially for the POF this app only works for Belo Horizonte MG, Brazil. But it can easily support more ciites.