"Open Educational Resources (OERs) are any type of educational materials that are in the public domain or introduced with an open license. The nature of these open materials means that anyone can legally and freely copy, use, adapt and re-share them. OERs range from textbooks to curricula, syllabi, lecture notes, assignments, tests, projects, audio, video and animation." -UNESCO
In academe, OER frequently refers to open textbooks and curriculum materials. Often, these are created by faculty members at colleges and universities and then put on the open Web with a creative commons (or similar) license.
The library supports faculty adoption of OER. Contact us if you are interested in having a webpage (similar to this one) created that links to your chosen resources which can be used in place of a traditional textbook.
Below are some major providers of open textbooks. These are free resources, many of which can be customized. In some cases, it is possible to download a pdf of an entire textbook free of charge. Most are designed in modules to make it easy to pick and choose which resources you would like for your course.