isk-daemon - isk-daemon is an open source database server capable of adding content-based (visual) image...
CamFind - CamFind is the very first mobile application that can photograph, identify, and provide information...
IQDB - Multi-service image search
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
PicsLikeThat - This is a visual and semantic image search system finding images on Fotolia.
DriverLayer Image Search Engine - Images of Everything on Best Image Search Engine After Google The DriverLayer.