I built a free 3D topographical route planner using Valhalla and PMTiles to snap to OSM data. I recorded a quick 30s demo of the routing engine working in the Alps: https://www.youtube.com/watch?v=dLsK0WiE_WA. I’d love for the mappers here to test it and tell me if the routing algorithm does anything stupid in your local area. Also, I know the 3D view of the alps shows some funny spikes (working on that) but any other problems or feature requests please let me know. Thanks to everybody in the community for the amazing map data and tools!
Edit: Oh, and here is the link: https://trailsplits.com/