I would love to learn how the routing algorithm works. This is probably one of a few opensource-but-in-production implementation of such kind of algorithms. here seems no doc in the repo unfortunately.

Still, it's very exciting to see they started from a "Helicoptor Router" [1] five years ago! The author clearly knew what they were doing.

[1] https://github.com/organicmaps/organicmaps/commit/7123f71eec...