Platform: Android; Free
Wanna ditch the car? Then hit up the Metro. Get realtime DC Metrorail, Metro Bus, Circulator, PG County-The Bus, Fairfax CUE, and UMD Shuttle updates, and Google Maps directions to each of the stops. You can set your favorite stops, for, say, work or your girl's house. You'll also have an interactive Metrorail map ready to go, so no more asking strangers where to go.