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Can run czkawka over the files to check for duplicates. It's free and has some decent options.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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If you wanted to set up a server to host the photos then there's Photoprism which has some neat features. If you just want a local organizer then digikam is worth checking out.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.
Related posts
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placed thousands of photos in the same folder
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Recommendation please. Looking for a file de-duplicator.
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Software to find similar/copies of photos
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Automatically find identical photos from two different libraries and replace the original metadata
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Official Question Thread! Ask /r/photography anything you want to know about photography or cameras! Don't be shy! Newbies welcome!