Optical character recognition, usually abbreviated to OCR, is the mechanical or electronic translation of images of handwritten, typewritten or printed text (usually captured by a scanner) into machine-editable text. It is used to convert paper books and documents into electronic files.
Lime OCR is build with tessearact-ocr which is an OCR Engine that was developed at HP Labs between 1985 and 1995, and now at Google.
Lime OCR was initially developed for internal use of Lime Consultants, and now published under GNU General Public License v3.
Lime OCR is free, simple to use and currently supports 29 languages, and support all tesseract-ocr trained data files. Lime OCR is fully UTF8 capable, and is fully trainable using tesseract-ocr.
Lime OCR is evolved from Tesseract-GUI by Juan Ramon Castan, so it includes all features of Tesseract-GUI, which is a Linux software.
As like Tesseract-GUI, Lime OCR is not a front-end for tesseract-ocr. It is just a graphical way to use it with simple image manipulation through ImageMagick.