Good tool for finding photo duplicates based on image data

SimilarImages is a free application designed to find similar images (duplicates) on your hard drives.

Description:

This simple GUI will help you to easy check your images for duplicates It includes the following Preferences:

  • Configurable Threshold: You may change the threshold depending on your needs. Once analyzed you may change the threshold without having to analyzed images again (if you don't alter the list)
  • Three search types:
    • Normal Search - which will compare all images with all other images
    • Inclusive Search - which will only compare images contained in same folder with each other
    • Exclusive Search - which will only compare images not contained in same folder
  • Semi-Automatic-Deletion: You may choose a rule which will preselect a file in review mode, so that you don't have to compare all the file properties yourself. Furthermore you may use the Auto-delete 0-Files feature which will apply the rule on all image pairs which are most similar.
  • Result Cache that will seamlessly cache all the generated data so that later searches for already analyzed files will be much faster.
  • Not-A-Match Database that will remember all non-matches.

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GQView is free and can find duplicate images by similarity:

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There is a Windows port, though I've only used it in Linux.