Cragfinder is an app which shows data about boulders, cliffs and cracks (ground cracks) easily on a map. It is intended to be used to scout for potential new crags.
The tech is very simple and does not require explanation (NodeJS & React).
It is easily extended. The script ./data-parser/index.ts can be used to extract POINTs or LINESTRINGs from a GeoPackage. You can easily fetch a GeoPackage of your own area and generate your own resources. Then just fork this repository.