The following list offers interdisciplinary resources for OER textbooks. Each link in this list will take you to textbooks in multiple areas of study. Below this list, you will find further links to OER textbooks organized by subject area.
The open resource movement's most common manifestation is open textbooks, which are starting to transform the face of undergraduate learning in particular. With this in mind, some universities have begun initiatives to offer stipends and other rewards to faculty members who implement curricula changes to replace traditionally published print textbooks with open alternatives. Most of the initiatives listed below offer extensive guides listing resources available to faculty who adopt open textbooks, as well as profiles of the projects they have put forward to this end.
Depending upon the individual course-related OER project, part of the transition from traditional print sources to open sources can involve writing one's own textbook (which may then be included in these open textbook resources). Here are some orientations to the process of writing an open textbook: