• Harvard Online Courses – Free and paid online courses from Harvard University, covering subjects such as business, science, technology, and humanities.

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• Stanford Online – Learning platform that offers free and paid courses, certificates, and degree programs from Stanford University across various academic and professional fields.​​

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• Google Scholar – Free search engine that provides access to scholarly articles, research papers, and academic publications from universities, journals, and institutions worldwide. 

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• Project Gutenberg – Digital library that offers free access to thousands of public domain eBooks, including classic literature, historical texts, and reference materials. ​​​​

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• OER Commons – Public digital library that offers free, openly licensed educational resources, including textbooks, lesson plans, and multimedia content for students and educator. ​​

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• Khan Academy - Free online learning platform offering interactive lessons, exercises, and instructional videos across various subjects, from math and science to humanities and test prep.

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• Coursera - Online education platform that provides free and paid courses, certificates, and degree programs from top universities and industry leaders in diverse fields

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• MIT OpenCourseWare - Free online repository of lecture notes, assignments, and course materials from MIT, providing open access to university-level education across various subjects.

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• Open Stax – Educational initiative that offers free, peer-reviewed, openly licensed textbooks and learning resources to support students and educators in a variety of subjects. 

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• Saylor Academy – Self-paced online courses in various academic and professional subjects, allowing learners to earn certificates and college credit at no cost. 

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• Codecademy - Interactive platform that provides coding courses in various programming languages, helping users learn and practice coding.

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• Duolingo - Online learning platform with gamified lessons in multiple languages to help users develop reading, writing, speaking, and listening skills.

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• edX - Online learning platform offering free and paid courses from top universities and institutions worldwide, covering a wide range of subjects including business, science, and technology.