as I have stopped using flickr myself, heroku has stopped their free tier and I have little time for this I am no longer running this service.
next-generation / angularjs flickr duplicate finder
easily find and tag duplicate images in your flickr account. currently uses filename and date_taken timestamp to identify duplicates, simple but often quiet effective. inspired by the now discontinued flickrdupfinder project.
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oauth authenticated access to flickr is proxied via my own instance of oauthd running on heroku: https://github.com/lefant/oauthd-lefant-heroku