Open Educational Resources (OERs) and Library-Licensed Content

For excellent math textbooks useful for university students, see these resources from AIM, includes statistics

From: California State University
The MERLOT system provides access to curated online learning and support materials and content creation tools, led by an international community of educators, learners and researchers.

OER Commons offers a comprehensive infrastructure for curriculum experts and instructors at all levels to identify high-quality OER and collaborate around their adaptation, evaluation, and use to address the needs of teachers and learners. Diving into OER Commons is an exciting opportunity to collaborate with other educators and learners, at the forefront of a new educational era.

Free and openly licensed textbooks in use by some universities

From: University of Minnesota
You can ensure that ALL of your students will have access to your course textbook content. In addition, you can edit the textbooks to fit your courses and best meet the needs of your students. Open textbooks are real, complete textbooks licensed so teachers and students can freely use, adapt, and distribute the material. Open textbooks can be downloaded for no cost, or printed inexpensively. This library is a tool to help instructors find affordable, quality textbook solutions. All textbooks in this library are complete and openly licensed.