Here’s a cool project: OpenTextBook. When I was at Acadia, we often wondered why students had to pay CAN$80 for a Calculus textbook when it was obvious that all such textbooks are the same, they have to be, and all of the content has been known for quite some time.
What are we paying publisher for, exactly? We could never quite figure out, but because, neither the university nor the professor ends up paying the bill, we keep asking students to buy expensive textbooks for no good reason.
To be fair, professors are not evil. Not all of them. Many wondered whether we could write a free calculus textbooks ourselves. I think there are some free textbooks but who would dare trusting them? I would trust a textbook that the community can peer review though. If people find mistakes, they can come in and correct the mistakes. It would not converge into a free, perfect textbooks, but it might end up producing an acceptable textbook, for sure.
I co-wrote this really cool document on Series. It is free! You can have the LaTeX source if you ask or are clever enough to navigate my hidden Web.
One day soon, I’ll co-wrote an open textbook. I should make a note of it.