TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
IQDB - Multi-service image search
SauceNAO - SauceNAO is a reverse image search engine.
Google Lens - Discover information about something by taking a photo
CamFind - CamFind is the very first mobile application that can photograph, identify, and provide information...
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.