Since 22nd of April, 2020 the first Open Source release of the multi-criterial timetable information system MOTIS (Multi Objective Travel Information System V0.1) is now available.
MOTIS Open Source (C) TU Darmstadt
One of its main features is computing optimal intermodal journeys (including private car, bicycle, bus, tram, trains, etc.) from door to door based on a real-time timetable. More information about MOTIS can be obtained from The mobility information system MOTIS as well as Unique features of MOTIS. Additionally the link to GitHub: Open Source MOTIS V0.1.