CamFind - CamFind is the very first mobile application that can photograph, identify, and provide information...
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
IQDB - Multi-service image search
Exif Metadata Image Search - Search image metadata on the Internet. Exif image metadata search engine
KartOO - KartOO ranks among the most powerful Meta search engines.
NISE - The NISE Image Search Engine is a reverse image search engine (like tineye.