http://www.free-ocr.com/

http://www.free-ocr.com/

For converting PDF, JPG, GIF, TIFF or BMP files to text (i.e., OCR)

Which OCR engine is tesseract using?
Tesseract

tesseract-ocr - Project Hosting on Google Code

An OCR Engine that was developed at HP Labs between 1985 and 1995... and now at Google.