This came a bit late. I recently decided I had to sort all my photos which I usually just dump in a big photos folder. Using the camera on my phone a lot and also getting a lot of media through whatsapp the collection was getting a bit big.

I made a script to calculate the hash of every file and if it found a double it would move it to another duplicate folder. This worked reasonably well but I couldn't stop thinking there should be more than 1 solution already made for this.