As I'm a teacher, I immediately checked it out and I saw that it is a very helpful tool for creating and evaluating tests. It offers a different type of questions: true or false, multiple choice, open-ended, so the test will be very interesting and not boring for the students. I will recommend this to any teacher I know, who are struggling with creating and evaluating tests. As I can see it is free unless you are using it often. Then, maybe it will require a payment. It is the only obstacle I can see, but as far as it is helpful, a little investment won't hurt:) Thank you for sharing this with us, it will be very useful for many teachers around the world!