Data for 2015, bubbles indicate user sessions
A growing number of authors have published open source interactive text books using the Runestone Tools. These textbooks are used all over the world.
You don't have to be a textbook author to use the Runestone Tools. Its quick and easy to make your own tutorials, labs, or publish class notes, for your students.
If you would like to use any of the books in your own course, you are welcome to do so. There are no fees, its all free.