- Connexions - Sharing Knowledge and Building Communities - An environment for collaboratively developing, freely sharing, and rapidly publishing scholarly content on the Web. Their Content Commons contains educational materials for everyone - from children to college students to professionals - organized in small modules that are easily connected into larger courses. All content is free to use and reuse under the Creative Commons "attribution" license. - ENGLISH
http://cnx.org
- eNotes - A comprehensive online educational resource, featuring online study guides, lesson plans, and other reference material in a wide range of academic areas. - ENGLISH
http://www.enotes.com
- Khan Academy - The Khan Academy is a not-for-profit 501(c)(3) with the mission of providing a world-class education to anyone, anywhere: watch, practice, learn almost anything for free, from arithmetic to physics, finance, and history, with more than 2,100 videos and 100 self-paced exercises. - ENGLISH
http://www.khanacademy.org
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