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1. Khan Academy – "a free plethora of online supplemental instruction videos for grades K-12 and beyond. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more."

2. MIT Open Courseware – "a web-based publication of virtually all MIT course content"

3. Open Stax – "Access to high quality textbooks"

4. Sapling Learning – "Sapling Learning online homework drives student success with one-on-one educator support and time-saving tools."

5. The Expert TA

6. Applied Math and Science Education Suppository (AMSER) – "A portal of educational resources and services built specifically for use by those in Community and Technical Colleges but free for anyone to use"

7. Center for Open Educational Resources – "Provides free teaching materials and resources for world languages including Arabic, Chinese, French, German, Portuguese, Spanish and many more"

8. OER Commons – "Teaching and learning materials that you may freely use and reuse at no cost"

9. Blended Learning Toolkit – "A free, open resource for educational institutions interested in developing or expanding their blended learning initiatives."

10. Multimedia Educational Resource for Learning and Online Teaching – "Browse thousands of online teaching and learning materials in MERLOT, including peer reviewed open educational resources."

11. Saylor – "Saylor Academy provides free and open online courses and affordable college credit opportunities to learners everywhere."