Amazon's Kindle Textbook Creator is an educational spin-off of the company's Kindle Direct Publishing division, which allows authors to self-publish. Focusing specifically on PDFs, this service converts them into organized educational material that include graphs, equations, charts and other sections often found in traditional textbooks. A great support system for authors and educators, they will be able to keep up to 70% of book royalties.
Through the use of Kindle Textbook Creator, students will be able to benefit from a number of tools including a multicolor highlighting tool, notebook feature to capture key passages, dictionary/Wikipedia lookup function and flashcards. It is a practical service on many levels. Mostly, however, people will appreciate that its free to use.