Click the image to download.
As you search, look for obvious display of the following:
Authorship and credentials
Peer review and affiliations
Intellectual property licensing:
Is there a fee model? Is this a company or a non-profit?
Are you required to register or pay for any services?
Is the license displayed?
Open Textbook Library - from the University of Minnesota
BC Campus OpenEd - open textbooks for the 40 highest enrolled first- and second-year subject areas in British Columbia's public, post-secondary system
College Open Textbooks Collaborative - focused on driving awareness and adoptions of open and peer-reviewed textbooks to more than 2,000 community colleges
MERLOT II - initiated by California State University, a curated collection of free and online learning materials, including multimedia resources.
PhET Interactive Simulations - Responsive and accessible STEM simulations
L4 Learning Library - A virtual resource exchange for assignments and learning activities
OER Commons - provides tens of thousands of open educational resources, including college-level open textbooks from higher education institutions around the world.
Open Oregon State Modules - open modules in the agricultural sciences and STEM fields that have dual-language functionality (Chinese-English and Spanish-English)
Teaching Commons - OERs from colleges and universities across the country
Public domain (unless otherwise noted):
Free to link to: