NAPS2 - NAPS2 is a document scanning application with a focus on simplicity and ease of use.
Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
Simple Scan - Project information. Part of: The Gnome Project. Maintainer: Simple Scan Development Team. Driver: Simple Scan Development Team. Licence: GNU GPL v3.
TextSniper - Instantly extract any text from your Mac's screen
XSane - A good proposal for SANE-2 has been written.
dpScreenOCR - Program to recognize text on screen