On: Maps.earth – free and open-source web maps

[easrng]

Looks like they use either mapbox gl is or maplibre gl js to render the map

[karussell → easrng]

I meant there are many ready-to-use map UIs out there already, like the UI from OTP or valhalla itself. No need to reinvent the wheel.

E.g. see https://valhalla.openstreetmap.de/

Or https://github.com/Qwant/erdapfel

Or https://graphhopper.com/maps2 & https://github.com/graphhopper/graphhopper-maps (disclaimer: I'm a contributor there)