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For details see This Blog Post
The mission of Runestone Interactive is to democratize textbooks for the 21st century. Textbook prices are too high, and paper textbooks are too old fashioned. We are changing that.
This project is Open Source, but it does take time and resources. Especially as our popularity has grown we have server costs. We were also able to make great progress during the Summer of 2013 thanks to a generous grant from ACM-SIGCSE that supported one of our undergraduate students. It would be great if we could have a student working on this all the time.
If these books have helped you, if you liked them, please consider making a small donation.Become a Patron!
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The books provided on Runestone Academy are free and open source. They are for educational purposes. As part of our educational mission we do collect usage data to help us better understand how you learn and how you use our books. In exchange, we may use this data to make decisions about revisions to the content, and we may use this data to publish academic papers. We would never publish anything that revealed your identity. We may share this data with fellow educational researchers, but rest assured that all personally identifying information will be anonymized before we do. If you have questions about this please feel free to contact us.