Some security researchers even believe that the CAPTCHA-breaking software was using Tesseract--an open source image recognition software sponsored by Google itself and used in its book-scanning projects--to recognize the distorted characters.

FORBES: Magazine Article

The prototype uses an open-source speech-recognition program called Pocket Sphinx, developed at Carnegie Mellon University, in Pittsburgh, but Dr Kristensson reckons it would be easy to apply the same approach to commercially available programs like Nuance's Dragon.

ECONOMIST: Monitor