I've decided that my students should not have to pay for a logic textbook. Most textbooks are obscenely expensive., but logic textbooks in particular get in my craw. The formal systems that they teach have been a part of the human intellectual heritage for over a hundred years, and the textbooks don't do anything in particular to make more approachable for students. They survive on the laziness of instructors, not on any originality content or presentation
So logic is going to be the first class that I teach to use a free, open access textbook. But which one? Changing textbooks is hard. For a long time I used Hurley at SLU I switched to Barwise and Etchemendy, but I never quite adapted to it, and since it was too sophisticated for LCCC students, I've gone back to Hurley. But Hurley is crazy expensive at $155. So what to do?
Here is my first very quick survey
blogic, by David Velleman: Respected author, looks like a nice approach, but seems to be pitched at the same level as Barwise and Etchemendy. Also, there doesn't seem to be a download or print version available.
For All x: Covers all and only the standard topics with the standard approach. It looks like I could take this on without seriously changing the preps from my Hurley course. Available as .pdf or as a print-on-demand book from Lulu. The author says that when he teaches it, he simply takes the book to the copy shop and has it printed as a coursepack. very nice.
Introduction to Logic Online interactive textbook. Would be nice if I were teaching online, but would be an adjustment from what I currently do. Covers all and only the topics I want to cover, though.
Introduction to LogicA collection of modules from the Conections website of free course modules. Hard to adapt or for cc students to relate to. Tied to the Teachlogic website which looks mostly like it is about infusing logic into the computer science curriculum.
Formal Logic from wikibooks. Doesn't look approachable.
Heck, the Magnus book looks like just the item. That was quick. I wounder how quickly I can replace all my texts with open access books. There are some books, like Liszka's ethics text that I wouldn't want to replace, just because the book is so high quality. Munson's bioethics book is also very popular among students. My intro class right now relies on primary historical sources, which are generally available for free on line, but students have little problem shelling out $10 for the penguin version. I guess Critical Thinking should be next.
Other open access textbook resources
Make Textbooks Affordable
Some free logic software from Hatzic. Not sure how to work this in pedagogically.