I was looking for a free mindmapping programme and I found examtime. I loved how easy it is to use but at the same time it gives you a lot of flexibility, plus, it is free.
I also tried the quizzes and flashcards and I thought they are great ways to revise and to study before exams. It is great that you can share anything you create with your friends. I am planning to let my classmates know and share the work so we have flashcards and quizzes for different subjects without having to do everything on my own.