There's a list of CBIR's on Wikipedia and ammong those there are a few open source ones. I didn't really had time to check them all but during skimming through

There's a list of CBIR's on Wikipedia and ammong those there are a few open source ones. I didn't really had time to check them all but during skimming through them imgSeek [2] caught my eye. [1] http://en.wikipedia.org/wiki/List_of_CBIR_engines http://en.wikipedia.org/wiki/List_of_CBIR_engines [2] http://www.imgseek.net/isk-daemon http://www.imgseek.net/isk-daemon