6 classes are annotated with MapProvider in Geolocation Field 8.3

Baidu in modules/geolocation_baidu/src/Plugin/geolocation/MapProvider/Baidu.php

Provides Baidu Maps API.

GoogleMaps in modules/geolocation_google_maps/src/Plugin/geolocation/MapProvider/GoogleMaps.php

Provides Google Maps.

GoogleStaticMaps in modules/geolocation_google_maps/modules/geolocation_google_static_maps/src/Plugin/geolocation/MapProvider/GoogleStaticMaps.php

Provides Google Maps.

Here in modules/geolocation_here/src/Plugin/geolocation/MapProvider/Here.php

Provides HERE Maps API.

Leaflet in modules/geolocation_leaflet/src/Plugin/geolocation/MapProvider/Leaflet.php

Provides Leaflet maps.

Yandex in modules/geolocation_yandex/src/Plugin/geolocation/MapProvider/Yandex.php

Provides Yandex Maps API.