routing

OSRM is a high-performance routing engine designed to run on OpenStreetMap data, offering fast route calculations with HTTP API, C++ library interface, and Node.js wrapper support.

GraphHopper is a fast and memory-efficient routing engine released under Apache License 2.0. It can be used as a Java library or standalone web server to calculate the distance, time, turn-by-turn instructions and many more for a route between two or more points.

OpenTripPlanner is a multimodal trip planning software that combines OpenStreetMap data with published GTFS transit feeds to provide comprehensive routing across walking, cycling, driving, and public transportation.

OpenRouteService is a comprehensive routing service offering directions, isochrones, time-distance matrices, and route optimization based on OpenStreetMap data with support for multiple transportation modes.