Trimetric is a real-time visualization of the Trimet public transit system in Portland, OR.
Features
* Real-time positions of Trimet buses and trains
* Tap a stop to see upcoming arrivals
* Tap a vehicle to follow it around the city
* Monitor an arrival as it travels to a stop
Trimetrics back-end, mobile app and website are all open source. You can find the code on GitHub (https://github.com/bsdavidson/trimetric)