Screenshot to Speech is described as 'This text to speech application is useful for your computer to read pdfs, scanned images or even kindle books' and is an app in the Office & Productivity category. There are nine alternatives to Screenshot to Speech for Windows, Mac, Linux, Android and iPhone. The best alternative is Capture2text, which is both free and Open Source. Other great apps like Screenshot to Speech are ABBYY Screenshot Reader (Paid), TextSniper (Paid), Kleptomania (Paid) and Easy Screen OCR (Freemium).
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.
TextSniper is a super useful app to quickly capture unselectable text. Use it to capture and recognize text from presentations, trainings, screencasts,images, pictures, webpages, video tutorials, photos, PDFs etc. Literally from anywhere on your mac's screen.
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.
You can use Easy Screen OCR to capture a snapshot and start OCR process. this program will detect the text from the image and start OCR process immediately. You can extract the text to copy and paste in seconds. No More Retyping
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.