Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
dpScreenOCR - Program to recognize text on screen
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Easy Screen OCR - Easy Screen OCR helps users capture screenshot and grab text from images.
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.
TextSniper - Instantly extract any text from your Mac's screen