Quick Scan - A scanner utility that enables you to quickly scan documents and manually set the DPI level...
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
TurboScanner HD - TurboScanner HD is an app for iOS that enables you to convert the iPad or iPhone into a useful scanner and also serves as small fax or air printer in your pocket.
Snagit - Screen Capture Software for Windows and Mac
Tesseract - Tesseract is an optical character recognition engine for various operating systems
OpenScan - FOSS Document Scanner