Digitransit is a next-generation journey planner developed in cooperation with HSL, Traficom and TVV LMJ Oy. Digitransit consists of multiple components that provide services for UI, routing, background maps, geocoding etc. Digitransit components are open source and available from HSLdevcom GitHub.
Digitransit has APIs for public transport data (stops, timetables, etc.), routing, geocoding, maps, points of interest and realtime data (disruptions, stop time predictions and vehicle positions). For more information, see Digitransit developer site.