There are 2 repositories under similar-images topic.
Image similarity in Golang. Version 4 (LATEST)
Detwinner - duplicate file finder for the Linux desktop
Fast image similarity search with hash tables (Golang). Version 2 (LATEST)
Finding similar images from image URLs using ImageHash
Source code for tutorial
Fast image similarity search with hash tables (Golang). Version 1
A desktop app that will help you find and deal with file duplicates on you drive
image quantization program with 3 different quantization algorithms (Kmeans,median cut,uniform quantization) and another program works as similar images search engine
A Python package to detect and extract the changed parts & coordinates of those parts from the images if any.