After 10 years, we have made a decision to redirect visitors from CollegeOpenTextbooks.org to other resources we believe are more valuable for students, teachers, and institutions.
We highly recommend the following repositories of fantastic open education materials:
The California nonprofit that has been the keeper of CollegeOpenTextbooks.org, COT Education, will continue its important work in making education more affordable. Find out more about us at www.coteducation.com
If you have additional interest in the College Open Textbooks project, one of the founders of COT Education worked with volunteer programmers on a prototype search engine for open textbooks. The code from that project, including the College Open Textbooks metadata, is now freely available in our Github repository. See this Readme file for a brief description of the system architecture.