CBIR-search engines contains try to analyse the actual picture itself to find matches.It analyzes what the "input-image" looks like and tries to find similar images. Some can filter on color or shape, other require you to upload an image (p.e. from the web or your computer). ALIPR - Automatic Photo Tagging and Visual Image Search. Image Recognition and Visual Search. List of CBIR engines.
TinEye is a reverse image search engine. It finds out where an image came from, how it is being used, if modified versions of the image exist, or if there is a higher resolution version. SnapTell - Visual Product Search-Mobile. PicsLikeThat - visual image search on fotolia. Elastic Vision - Content-based Image Search. Retrievr - search by sketch / search by image. GazoPa similar image search. ImgSeek. Similar Images - find the right image - fast. Image Search. RevIMG - Reverse visual search.