I halfheartedly maintain a list of interesting open source routing implementations: https://gist.github.com/systemed/be2d6bb242d2fa497b5d93dcafe...

hey systemed! thanks so much for tilemaker! it's incredibly useful.

No problem! It's come on in leaps and bounds this year thanks to a great new contributor.

Valhalla is also open source and in production: https://github.com/valhalla/valhalla

It's used (or even built) by Mapbox? Very cool! Thanks for the pointer!

Leaving a couple of google results for interested folks like me:

  * https://blog.mapbox.com/mapbox-%EF%B8%8F-valhalla-1fdda95ac4f
  * https://blog.mapbox.com/valhalla-is-live-on-mapbox-d868e8d41611

Copied links

- https://blog.mapbox.com/mapbox-%EF%B8%8F-valhalla-1fdda95ac4...

- https://blog.mapbox.com/valhalla-is-live-on-mapbox-d868e8d41...

MapBox hired the Valhalla team after Mapzen went out of business.

Valhalla is fantastic, especially since it can run completely offline. I had a project where I had to calculate isochrones of different radii around 10s of thousands of points. Using an online API would have taken several hours to run and cost a non-trivial amount of money.

By downloading the OSM data and running Valhalla locally I could process the data in minutes completely for free

There are some interesting resources available on the BRouter algorithm: https://brouter.de/brouter/index.html

The source code is here: https://github.com/abrensch/brouter

OsmAnd also has good routing on phones. Possibly uses the algo from GraphHopper or OSRM, which are afaik go-to solutions for OSM routing.

You might be interested in links from https://wiki.openstreetmap.org/wiki/Routing

OsmAnd has a separate routing algorithm to my knowledge (was one of the first). It is definitely not GraphHopper as I created it later and prefer the routes it creates ;) but you can study our documentation to get a rough understanding how it all works: https://github.com/graphhopper/graphhopper/blob/master/docs/... and reach out in our forum for more details.

The algorithm from maps.me / Organicmaps is ported from OSRM to Android and iOS. The CTO of maps.me that did this port left maps.me in 2017 but now seems to work on Organicmaps again: https://github.com/biodranik

GraphHopper is anazing. Thank you! I also prefer the routes it creates and use it for bicycle routing.

This wiki is amazing! Thanks for the pointer!

What is a "helicopter router" (helicopter routing?)? That's the first time I've heard that term and it sounds interesting.

It's a straight line ;-)

"crow" would have been a more obvious reference

You can’t ride a crow.

With a large enough flock you can.

Gwaihir routing, then.

Ha, got it. Thanks for enlightening me — that helicopter flew right over my head.

It's a modified A*. Our code is open, you may learn and improve it :)