Phind - Shazam for landmarks and locations
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Snap Visual Search - Search for products and buy from Amazon via Snap's camera
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
Songbird - With a focus on fans, Songbird personalizes music content from the artists you love the most.
Yandex.Images - search for images on the internet, search by image