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I run Dupeguru first, then switch to AntiDupl to pick up more duplicates. Those two programs usually catches most of it, and both has their own good UI for going through the duplicates and visually confirm and select for deletion.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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This has worked fairly well for me https://github.com/qarmin/czkawka
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.