Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
dpScreenOCR - Program to recognize text on screen
Prizmo - Prizmo is a scanning application for Mac with Optical Character Recognition (OCR) in over 40 languages with powerful editing capability, text-to-speech, and iCloud support.
Easy Screen OCR - Easy Screen OCR helps users capture screenshot and grab text from images.
GOCR - GOCR homepage. GOCR is an OCR (Optical Character Recognition) program, developed under the GNU Public License.