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Connexions

http://cnx.org/

Connexions is a place to view and share educational material made of
small knowledge chunks called modules that can be organized as
courses, books, reports, etc. Connexions is an environment for
collaboratively developing, freely sharing, and rapidly publishing
scholarly content on the Web. Our Content Commons contains educational
materials for everyone — from children to college students to
professionals — organized in small modules that are easily connected
into larger collections or courses. All content is free to use and
reuse under the Creative Commons "attribution" license.