There are many open materials out there, and these repositories can help to sift through the content.
OER Commons - provides tens of thousands of open educational resources, including college-level open textbooks from higher education institutions around the world.
PhET Interactive Simulations - Responsive and accessible STEM simulations
MERLOT II - initiated by California State University, a curated collection of free and online learning materials, including multimedia resources.
L4 Learning Library - A virtual resource exchange for assignments and learning activities
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
Open Textbook Library - From the University of Minnesota, includes a wide variety of open textbooks.
Open SUNY Textbooks - Textbooks created by faculty at the State University of New York (SUNY).
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.
Google Advanced Image Search - select "usage rights" to filter results
Metropolitan Museum of Art - Public domain images marked "OASC"
LACMA - Search by checking "Show public domain images only"
Public domain (unless otherwise noted):
Creative Commons licensed:
Free to link to:
Research Channel (on YouTube) *also embedable
YouTube EDU * also embedable
U.S. National Archives (on YouTube) *also embedable
SnagFilms *also embedable
TED *also downloadable
TEDed - A new area on the site offering educational video content. May require review.