2GIS - 2GIS provides 3D-maps of 180+ cities, contacts of 1.
TransSee - Real time transit prediction and bus tracker web app.
OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
Citymapper - The ultimate transport app - iPhone / Android / Web.
RMaps - RMaps is the navigation tool. You can use RMaps like online map viewer for some popular maps.
BusWhere - BusWhere is a bus navigation application that is used to monitor the bus routes in real-time and you can get a notification when the bus is reaching your stop.