Topic OMR = Opitical Mark Readering
Optical mark recognition (OMR) is the process of capturing human-marked data from document forms such as surveys and tests. (more details at https://en.wikipedia.org/wiki/Optical_mark_recognition)
Best free software = FormScanner www.formscanner.org
Formscanner is a free, open-source OMR (optical mark recognition) software for scanning and grading user-filled, multiple choice forms. Formscanner is easy to use, effective, and completely free of cost and advertisements. Users scan the forms and, in just a couple of steps, they have a spreadsheet with students' scores, answers to individual questions, and detailed analysis of the class' perfomance. Other OMR software costs hundreds, but FormScanner is open-source, community-supported, easy-to-use, and excellent at what it does.
Poster Overview
Example Course Evaluation with 30 Questions (Date + ID)
How to convert scanned images in a PDF (photocopy) back to Images Click Here