IQDB - Multi-service image search
isk-daemon - isk-daemon is an open source database server capable of adding content-based (visual) image...
SauceNAO - SauceNAO is a reverse image search engine.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
DriverLayer Image Search Engine - Images of Everything on Best Image Search Engine After Google The DriverLayer.
Exif Metadata Image Search - Search image metadata on the Internet. Exif image metadata search engine