"NASA Science Update - The Voyager Spacecraft - Humanity's Farthest Journey" by NASA is in the public domain.
Textbooks
- The Basics of General, Organic, and Biological Chemistry A CC BY-NC-SA chemistry textbook by Andy Schmitz for Saylor Academy
- OpenStax Science OpenStax offers textbooks for biology, chemistry, and physics.
Multimedia
- Cell Image Library Public repository of reviewed and annotated images, videos, and animations of cells from a variety of organisms
- Encyclopedia of Life The Encyclopedia of Life works with open access biodiversity knowledge providers around the world, including museums and libraries, universities and research centers, individual scientists, graduate students and citizen science communities, and a suite of international open data hubs to gather information about many life-forms on Earth in one location.
- National Science Digital Library (NSDL) The NSDL provides high-quality online educational resources in STEM. Most resources in the library are openly licensed.
- PhET Interactive Simulations The PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science games.
