Gallery

Duplicate Image Detection.
A module to find duplicate images and provide a user interface to do
actions to these items: ( delete, link, etc).

Complete the SoC (
http://codex.gallery2.org/Gallery2:SummerOfCode#Duplicate_Image_Detection )
module.
Start of code:
http://sourceforge.net/project/showfiles.php?group_id=142706&package_id=162
402&release_id=353169
but has not been updated in some time.