The following resources contain existing open texts that are openly-licensed and free for educators to use and adapt to their own needs.
OpenStax College offers students free textbooks that are peer-reviewed & written by professional content developers.
Open Academics Textbook Catalog
Hosted by the University of Minnesota, this site is a catalog of 150 open textbooks covering Business, Accounting, IT, Economics, Math, Humanities, Law, Math & Statistics, Natural, Physical and Social Sciences.
Orange Grove Text
Florida’s operational repository project of open source educational materials.
College Open Textbooks
lists open textbooks by subject, many of which have been peer reviewed.
Global Text Project
The Global Text Project is a joint project of the Terry College of Business of the University of Georgia and The Daniels College of Business of the University of Denver. A collection of open textbooks in the areas of Business, Computing, Education, Health, Science and Social Science.
Content Commons of free, open-licensed educational materials in fields such as music, electrical engineering and psychology.
Community College Consortium for Open Educational Resources