The following sites contain open textbooks in a variety of subject areas, but the links below will take you directly to the textbooks about computer science. This is by no means an exhaustive list!
College Open Textbooks (COT) focuses on textbooks for lower division classes. COT is not a repository in itself; their listings point to textbooks in other repositories. Licenses vary. Verify individual items.
These books have been reviewed by faculty from a variety of colleges and universities to assess their quality. These books can be downloaded for no cost, or printed at low cost. All textbooks are either used at multiple higher education institutions; or affiliated with an institution, scholarly society, or professional organization.
InTech publishes more than 2,300 open textbooks and 6 journals in a variety of subjects that fall under the heading of science, technology, and medicine.
The Global Text Project is a joint initiative between the Terry College of Business (University of Georgia) and The Daniels College of Business (University of Denver) to publish eBooks that can be accessed by all, especially the developing world.
Open Culture attempts to collect "the best free cultural and educational media on the web." They've compiled lists of free and open textbooks written by knowledgeable scholars.
Lumen Learning offers open courses in a variety of high-demand subjects and disciplines. These courses are collections of high-quality OER, not necessarily as a traditional textbook. You can use them as-is or modify them to fit your instructional style and students’ needs.
MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course content. OCW is open and available to the world and is a permanent MIT activity.
Saylor Academy contains full courses, including syllabi, readings, quizzes, and more.
Open Culture attempts to collect "the best free cultural and educational media on the web." They've compiled lists of free courses in computer science.
Multiple Types of Resources
Open Learn is an initiative of The Open University, UK. It provides supplemental materials for educators, including articles, podcasts, videos, games, and much more. In addition, it offers more than 700 free online classes.
MERLOT is a curated collection of free and open online teaching, learning, and faculty development services contributed and used by an international education community. The MERLOT Collection is made up of over 40,000 materials in 19 different material type categories.
OER Commons helps educators, students, and lifelong learners avoid time-consuming searches and find exactly the right materials. With a single point of access from which they can search, browse, and evaluate resources in OER Commons’ growing collection of over 50,000 high-quality OER everyone can more efficiently find what they need.
Searches 15 OER repositories simultaneously.