The special section here is called digimedoo, which stands for “Digital Media for Education.” It’s a simple place for putting all developed media so far in relation to education. Check this link. There are some trials, published works, and free ones. A list of published books in digital versions can be seen here. This only includes publications from Google Book. A complete collection of media that includes published books in digital format is available in my Wakelet.
Hope to benefit you all in many ways. Thank you for reading!