A free Android Gallery App to manage local photos: find, sort, view, copy, delete, send with Geotag support: set gps exif data, show in map, find via geoarea/map.
It open-source and available via the f-droid store, but not on the Google Play Store.
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Pro Powerful geotagging/openstreetmap integration
A map shows where photos where taken. if you zoom in you see more details. Geotagging: select one or more photos + "set geo" + pick a point in the map ==> the selected images get that point. Filter images through the map: after selecting an area in the map (i.e. North Germany), the gallery will only show images from North Germany.
Pro Can handle big image collections
15000+ images in 1000+ folders.
Pro It is free
Open-source, no ads, no user tracking.
Pro Quick hirarchical folder navigation
Only folders that contain pictures are shown.
Con It is not available on the Google Play Store
You have to download it via f-droid.org store.