Citizendium, powered by MediaWiki, is "an open wiki project dedicated to creating a free, comprehensive, and reliable repository of structured knowledge". Unlike with Wikipedia, a contributor must register using their real name and verify their identity.
Looking for a program that is like Citizendium? We have our top picks here. If you need another program that has some of the features of Citizendium on your device, read what we recommend in this post.
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Stubia is a mobile encyclopedia that limits each article to 160 characters: this limitation makes each topic easy to understand.
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