@organicmaps
I'm already using this wonderful feature to prepare and "publish" a set of bookmarks with places to visit in Japan (see https://marcoxbresciani.codeberg.page/japan/viaggio-in-giappone.html#vig-uso-mappa, Italian only), recommending the use of OrganicMaps (fron @fdroidorg !) to all colleagues and friends (and whoever else) asking me about Japan.