Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
Boxoft Screen OCR - BOXOFT SCREEN OCR is a fast desktop utility program that lets you to capture screen and convert screen text into editable electronic text files fast and easily.
Yandex.Images - search for images on the internet, search by image