"Open Educational Resources 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).
Open Access Textbooks : Resources for faculty who publish textbooks and students who use them.
Open Access Textbooks Task Force : Get your activisim on.
College Open Textbooks : OA textbooks and advocacy resources.
TextbookRebellion.org petion and advocacy group.
Open Course Library an almost free collection of expertly-developed educational materials – including textbooks, syllabi, course activities, readings, and assessments – for 81 high-enrolling college courses. 42 courses have been completed so far, providing faculty with a high-quality option that will cost students no more than $30 per course.