CompareDir
Tool to Compare 2 directories and handle the files.
...Note the program cheqs FileName, FileSize, FileDate and (sub)directory. It does not compute md5 sums because that would make it extremely slow. Mind you i use this regular for directories with 2000 photos.
Based on Python, pygobject and gtk3.
+ Python-pillow if you want to compare 2 images.
No installation:
untar -xvzf CompareDir.tgz
where you want and run.