Screen OCR - Screen OCR is a screen capture and character recognition tool.
Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
Project Naptha - Highlight, copy and translate text in any image (Chrome)
TextSniper - Instantly extract any text from your Mac's screen
dpScreenOCR - Program to recognize text on screen
CopyFish - Copy, paste and translate text from any image, video or PDF.