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[Encyclopedia.com] is a free online encyclopedia that uses a mix of over 100 sources like dictionaries and biographies. An excellent research tool with a wide range of subjects that will be of great use to students and people investigating a particular subject.The CMS based free encyclopedia called [http://www.open-site.org/ Open-Site] is edited by volunteers that must apply first to be granted access, page edits are peer reviewed by a senior contributor. This community project runs on a content management system (CMS) instead of a wiki like Wikipedia, some may find it easier to navigate and better structured.The Smithsonian Institution offers a free educational online encyclopedia called [http://www.si.edu/Encyclopedia Encyclopedia Smithsonian]. Since they are a US research institute and museum, their encyclopaedia includes articles with links to their exhibitions, in some cases complemented with audio and video.