PicsLikeThat - This is a visual and semantic image search system finding images on Fotolia.
CamFind - CamFind is the very first mobile application that can photograph, identify, and provide information...
IQDB - Multi-service image search
Exif Metadata Image Search - Search image metadata on the Internet. Exif image metadata search engine
isk-daemon - isk-daemon is an open source database server capable of adding content-based (visual) image...
GazoPa - 27 Oct 2009 . Gazopa, a search engine that uses features from an image to retrieve similar images, has been in private beta since it launched during TechCrunch50 last year.