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Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Khan Academy - Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
Coursera - Build skills with courses, certificates, and degrees online from world-class universities and companies
Oppia - Oppia is a free, open-source learning platform.
edX - Best Courses. Top Institutions. Learn anytime, anywhere.