GT Text is described as 'Copy image text fast with in any of 98 top languages' and is an app in the Office & Productivity category. There are more than 10 alternatives to GT Text for Windows, Linux, Mac, Online / Web-based and iPhone. The best alternative is Tesseract, which is both free and Open Source. Other great apps like GT Text are ABBYY FineReader PDF (Paid), GImageReader (Free, Open Source), Capture2text (Free, Open Source) and ABBYY Screenshot Reader (Paid).
ABBYY FineReader PDF is an OCR software that provides unmatched text recognition accuracy and conversion capabilities, virtually eliminating retyping and reformatting of documents. Up to 190 languages are supported for text recognition.
Capture2Text enables users to do the following: 1. Optical Character Recognition (OCR) Allows the user to quickly snapshot a small portion of the screen, OCR it and (by default) save the result to the clipboard. 2.
Kleptomania lets you select text anywhere on the screen, including areas that you cannot highlight with your mouse, such as columns of data from a word processor or error messages from any Windows program.
Screen OCR is a screen capture and character recognition tool. You can use Screen OCR in any way you are most comfortable with. It can be window selection, scrolling capture, simple cursor capture or rectangular selection.
Apparently JOCR requires Microsoft Office 2003 or 2007 and won't work with Office 2010 (unless you also have an older version and do some tweaking).  JOCR enables you to capture the image on the screen and convert the captured image to text.