For instance, I caught a link to imgSeek, which is a photo collection manager with content-based search. Basically this means queries can be express as a rough sketch or you can start with a single image and find similar images in your collection. For example, select a sunset as your starting image and imgSeek will find images with alike characteristics. Very cool!
Best of all… imgSeek is Open Source Software written in Python.
Binaries are available for Linux and OS X. imgSeek will run under Windows, but there’s a licensing issue with one of imgSeek’s libraries (QT 3.x), which prevents the author from distributing a Windows native binary for the time being. I’m sure that’ll be worked out soon, but in the meantime I’ll be checking it out under Debian.