Wikipedia is described as 'Free content, multilingual online encyclopedia written and maintained by a community of volunteers through a model of open collaboration, using a wiki-based editing system' and is a leading Encyclopedia in the education & reference category. There are more than 50 alternatives to Wikipedia for a variety of platforms, including Web-based, Android, iPad, iPhone and Linux apps. The best Wikipedia alternative is Encyclopædia Britannica, which is free. Other great apps like Wikipedia are Kiwix, Scholarpedia, Wikiless and WikiReader.
WikiPathways was established to facilitate the contribution and maintenance of pathway information by the biology community. WikiPathways is an open, collaborative platform dedicated to the curation of biological pathways.
Hypatia is a research tool for the Linux desktop. It's designed to provide at-a-glance information about the topics you're reading, or about things you're curious about. It lets you find definitions, explanations, and answers related to the text on your display...
Wikipedia is probably the single largest, most comprehensive and simply best information resource out there on the Internet - a really great resource.many people though would like to have access to this giant resource when they're not plugged into the Internet.
Kiwix-serve is a ZIM compatible Web server. With its help you can deliver ZIM file content over your network. Designed to serve Wikipedia zim files over LAN in an offline setting.
WikiGenes is the first wiki system to combine the collaborative and largely altruistic possibilities of wikis with explicit authorship.
Okawix lets you download the whole content of Wikipedia, with or without images, so that you can browse it offline:
Conzept is an attempt to create an encyclopedia for the 21st century. A modern topic-exploration tool based on Wikipedia, Wikidata, Open Library, GBIF and other useful information sources.
User-editable encyclopedia for fans of anthropomorphic animals. Over 18,000 articles on furry community and culture in twenty-one languages.
Logopedia is a collaborative database for logos and corporate branding. It includes the history of successful company logos, popular branding, and more.
Logopedia is only about logos, Wikipedia is about basically everything
Germany
EU
Switzerland
Doesn't function as an encycolpedia