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.

Get the latest version of Process Bubbles on the downloads page.  It can now deduct points for incorrect answers and apply partial credit when a student gets some of the multiple responses correct.  It can also support multiple versions of exams.