I wonder how to go about to collaborate to the OSM ecosystem with code. Does anyone know what are the cool projects within OSM in C/C++? (i.e. not web stuff)
The most accessible general-purpose map app for end users (Android and iOS) is written in C/C++. This is pretty high on the cool and useful scale: https://organicmaps.app/ Both map renderers Tangram-ES and Maplibre-GL - https://github.com/tangrams/tangram-es and - https://github.com/maplibre/maplibre-gl-native are also written in C/C++. Finally, most routing software, such as OSRM or Valhalla are written in C/C++.
Android: https://play.google.com/store/apps/details?id=cz.seznam.mapy...