Comparing different OCR packages

Optical Character Recognition (OCR) is a widely used technology for extracting text from the scanned or camera images containing text. There are different types of Open source and Commercial OCR Software. In this article, We will compare between the best of the available OCR software in the Open source and Commercial.     A general Comparison between different OCR software is given in this wiki article. But There is no sample data on the OCR efficiency.