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Solving World War II Photo Mysteries With Open Source Techniques - bellingcat
(www.bellingcat.com)
All about open source! Feel free to ask questions, and share news, and interesting stuff!
Community icon from opensource.org, but we are not affiliated with them.
They do all the actual searching with Google Maps, Lens and Images. None of that is Open Source, just the site to host the results and findings if I understood the article correctly.
The very first phrase of the article talks about open source investigative techniques, not about open source software, both are very different things.