These links will take you directly to the portions of databases that contain materials relevant to Biology. However, this is by no means an exhaustive list. Feel free to explore the General Collections to find additional resources.
A program of the California State University, providing a database of more than 40,000. These materials include open textbooks, journals, and articles, animations and simulations, assignments and quizzes/tests, case studies, and reference materials.
Offers educators a wide variety of multimedia content online, including videos, animations, and simulations. An additional feature offers educators the ability to create "playlists" for their students, which correlate specifically to their particular instruction material. Site-specific license.