Have you checked out the Open Logic Project recently? Created a few years ago, it’s an open-source, collaborative logic text that has several nice features. One is that the material is modular: it can be “remixed” into individual open-source texts on specialized subjects. There are now a few examples of this.

You can check them out on the Project Builds page. You can also check out the entire Open Logic Text in a few formats (including PDF) and individual sections it. If you’re interested in making your own remix of the material, there are some preliminary instructions here.

Thanks to the project’s “Instigator”, Richard Zach (Calgary) and the other editors and contributors for developing this resource.

Related: “Illustrations of Logicians“; “Publishing Your Philosophy Book with Open Access“; “What Is the Best Type of Open Access for Philosophy and Other Humanities Disciplines?“; “An ‘Open Textbook’ for Introduction to Philosophy“