Interviewer is one of our most commonly used programs.
It includes a form that the student fills out and submits. ThoughtPro is a program similar to Interviewer. The student fills out a form, but the output is funneled to a new html page where the student can compare his answer with what others have answered to the same question. Educookie gives an explanation on how to install the 'cookie' program on each lesson page. Interviewer and ThoughtPro include instructions for installation, as well.