photon VS Graphhopper

Photon by Komoot is also using Elasticsearch for validating addresses and locations.

Alternatively, you could run your own Photon API: https://github.com/komoot/photon

Open Source. The routing server is open source too and geocoding too.

To fully self-host a route planner (e.g. a "Google Maps" equivalent) you need GraphHopper for the routing and two other parts: you also need some visualization aka "maps" (e.g. with OpenMapTiles) and you need the address search (e.g. with Photon).

There exists photon, but I don't know if it's used in any libre mapping app.

Acastus-Photon is an Android app that allows you to search up any address or point of interest on OpenStreetMaps and open it in OsmAnd or any other maps app. It relies on photon as it's open-source backend server (provides elasticsearch for OSM), so you can either use a public instance or self-host. This allows you to have search functionality as powerful as Google Maps whilst being able to use solely open-source software instead.

Well I think what he means is that we dropped the explicit support of Android and the example app with offline maps (Mapsforge), see this issue: https://github.com/graphhopper/graphhopper/issues/1940

But offline routing should still work on Android. But as you need JDK 1.8 support this will exclude a few older Android versions and devices, I think.

Graphhopper. It has an Android client that uses its web service. You can also try out the web app.

This is now fixed and deployed. See the route here and the specific fixed examples here. Note that you can still find the dangerous spots via clicking the "stop" icon below the route information multiple times. But this is likely a result of the bad cycling infrastruture as cycle.travel contains these short dangerous parts too and if you do such longer routes for Germany it does not happen.

I'd suggest refactoring to use a self hosted version of Graphhopper (https://www.graphhopper.com/open-source/ - they have a docker image you can use and pass in an OSM file to build a graph on) or OpenRouteService to limit your cost exposure to google.

Open Source. The routing server is open source too and geocoding too.

Valhalla is great (I've contributed a few patches and run it for a while)!

Also check:

http://project-osrm.org/

https://www.graphhopper.com/open-source/

if you attached a geolocation to each meeting that should be possible. either using the google maps API or a self-hosted graphHopper instance

I just improved the documentation for the map matching a bit. Maybe this also helps a bit.