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A collection of open-content textbooks that anyone can edit.
http://en.wikibooks.orgsite info

A free-content encyclopedia, collaboratively written and edited by users worldwide. Browse by keyword, alphabetical index, or reference categories such as culture, geography, history, mathematics, science, society and technology.
http://www.wikipedia.orgsite info

A worldwide collaborative project to produce a free multilingual dictionary in every language, with definitions, etymologies, pronunciations and quotations.
http://en.wiktionary.orgsite info

Discussion forum, wiki, journals and resource galleries where members can share files, drawings and images with other members in the architecture, construction and engineering industries. info

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