At first, when I came across this free e-book source, I was suspicious that this website will be our regular free e-book scam full of links that lead to anything, but the e-books. However, after some quality time spent on Open Culture, I was impressed by the textbook section.
To access it, press “Textbooks” on the right top corner. Though, the list of free textbooks is not very extensive, the variety of subjects is pretty nice: Linguistics, Physics, Mathematics, Political Science, Music, History, Biology, Economics & Finance, Engineering, Earth Science etc.
The textbooks are offered in various formats. The reason for this is that the books are hosted on different servers. This is a well selected collection of links that lead to text-books’ locations. For example, A Textbook of the History of Painting by John Charles Van Dyke is actually located on Project Gutenberg site. Hence, there is an option for downloading it in MOBI format for your Kindle. Introduction to Physical Oceanography by Dr. Robert Stewart is hosted by Texas A&M University and it is in PDF format. Calculus by Gilbert Strang is offered by MIT in PDF format.
Open Source’s list of textbook perhaps is one of the better lists I’ve seen so far. Hopefully, you kindlized students out there will find this source useful. Happy studying!