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, Linux and iPhone apps. The best Wikipedia alternative is Encyclopædia Britannica, which is free. Other great apps like Wikipedia are Kiwix, Scholarpedia, Grokipedia and WikiReader.
The Encyclopædia Britannica is a general English-language encyclopaedia published by Encyclopædia Britannica, Inc., a privately-held company. The articles in the Britannica are aimed at educated adult readers, and written by a staff of about 100 full-time editors and...
Provides offline access to Wikipedia and HTML content via ZIM format, featuring a full-text search engine, multi-language interface, export capabilities, bookmarks, content manager, and support for Windows, macOS, Linux, Android, USB drives, and local servers.
Scholarpedia is a peer-reviewed open-access encyclopedia written and maintained by scholarly experts from around the world. Scholarpedia is inspired by Wikipedia and aims to complement it by providing in-depth scholarly treatments of academic topics.
Grokipedia is an online encyclopedia created by xAI that positions itself as an alternative to Wikipedia. Articles are generated and later labeled as “fact checked by .
Non-profit history encyclopedia with the mission to engage people with cultural heritage and to improve history education worldwide.
Metapedia is an electronic encyclopedia which focuses on culture, art, science, philosophy and politics.
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.
HandWiki is a wiki encyclopedia dedicated to scientific computing and science. This wiki can be used for collaborative editing of articles about applications of computers and software programs in different areas of science, finance and engineering.
XOWA is the free, open-source application that lets you download Wikipedia to your computer. Access all of Wikipedia offline -- without an internet connection!
Oppia is a free, open-source learning platform. Full of interactive activities called 'explorations', Oppia helps curious minds learn and teach.
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Reliable source but not complete.