Backpack booksClosed

http://backpack-books.com/
Publish textbook authors over the web All our textbooks are available both via the web, and in print. Students can buy the books chapter by chapter. All of our books are accessible to people with disabilities. We pay a lot of attention to usability, making sure the books are as easy to use as possible. Our books are searchable. We take every highlight done using our system as a signal indicating which parts of the text are most important, thus creating a highlight heat map of the text. Students receive updates to the texts they own as soon as they're made available by authors, so the content of the text never expire, allowing the book to become reference material later on in the student's life.