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It has been a while since I check, was surprised by your reply, went to check and you are right, not opensource, based on Openstreetmaps... Oh well..., time to do some research and reconsider, not in F-Droid neither and you well stated. Thanks for keeping me straight, highly appreciate it!
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Magic Earth is not open source, and it's also not in f-droid.
Do you have a link to the source code?
Also, it's only available from App Stores, no apk available.