There is Cesium. But the thing you actually need is the actual maps. There are free maps (many of them based on OpenStreetMap), but the fidelity you know from Google Earth is usually not free. Also if you also want to self-host the actual maps you need a tile server for that and lots of disk space because these tiles take up a lot of it...
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If you don't mind some learning curve, check out QGIS: https://qgis.org/ ...it can pull data in from many different sources and it's free :)
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When I last played with this a decade or so ago, there were several map tiling solutions in the geosciences that are self hosted.
From memory, "World Wind" is a good search term, but there's others.
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osm? I'm not sure what you're looking for.
Not really selfhosted, but a decent open source app:
https://marble.kde.org/features.php
You probably can put it in a kasm workspace or noVNC docker container if you really want to selfhost it.
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Build a spaceship
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