ABBYY FineReader - ABBYY's latest PDF editor software, FineReader 16 you can easily convert files like PDF to Excel, PDF to Word, edit, share, collaborate & more with this PDF editor!
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
TextSniper - Instantly extract any text from your Mac's screen
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
dpScreenOCR - Program to recognize text on screen