There are thousands of OERs on the web! You will be able to evaluate the content best, to find what works for your courses.
Here are some additional factors that can help evaluate OERs you find on the web:
➔ The Mason OER Metafinder launches a real-time, simultaneous search across 22* different sources of open educational materials.
➔ Openly Available Sources Integrated Search (OASIS) currently searches open content from over 80 different sources and contains over 300,000 records. It was developed at SUNY Geneseo's Milne Library and built by Bill Jones, Digital and System Resources librarian and Ben Rawlins, Library Director at SUNY Geneseo.