AliPrice - AliExpress Price Tracker app lets you track the price history of any item from many online retailers like AliExpress, Daraz, and Amazon, etc.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
PriceGrabber - Get the lowest prices on computers, electronics, furniture, cameras, clothes and more.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
Price Tracker for Amazon - Price Tracker for Amazon is a shopping app that allows you to browse for favorite products from famous online stores know as Amazon for a better price.
Yandex.Images - search for images on the internet, search by image