2. CK-12 Flexbooks This resource series is a collection of free Flexbooks(eBooks)offered by the CK-12 Foundation.
3. Harvard Open Learning Initiative The Harvard Extension School’s Open Learning Initiative brings a selection of noncredit online courses featuring Harvard faculty to the public for free.
4. History Animated Collection of depictions of the key naval and land battles in WWII (Pacific Battles), US Civil War and the US Revolution using animation technology.
5. Khan Academy Large k-12 and Higher Education video tutorial lecture series.
7. Math Open Reference Math Open Reference uses interactive tools and compelling animations to provide an engaging way to learn and explore geometry.
8. MIT Open Courseware This series is a collection of the Massachusetts Institute of Technology OpenCourseWare course materials that reflect undergraduate and graduate subjects taught at MIT.
9. NASA at 50 Video Collection NASA at 50 highlights key innovations and milestones in chemistry, physics, engineering, and space exploration from NASA’s fifty-year history.
11. Open Yale Courses Open Yale Courses provides free and open access to a selection of introductory courses taught by distinguished teachers and scholars at Yale University.
12. PhET Simulations PhET provides fun, interactive, research-based simulations of physical phenomena for free.
13. ReadWriteThink This K-12 series includes 54 student interactive resources that focus on all aspects of literacy including literature, vocabulary, spelling, writing, and speech.
14. Smithsonian Education The Smithsonian Education resource series is a collection of the “Smithsonian in Your Classroom” and the Smithsonian “Art to Zoo” publications as well as the Smithsonian Lessons grade level packages.
15. Virtual Cell Animations The goal of the Virtual Cell (VCell) animation project is to create high-quality animations of selected molecular and cellular processes that support student learning.