The best Encyclopedia alternative to Fandom is Ibis Wiki, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Fandom and five of them are Encyclopedias so hopefully you can find a suitable replacement. Other interesting Encyclopedia alternatives to Fandom are MediaWiki, Alchetron, Citizendium and Stubia.
Ibis is a federated encyclopedia which uses the ActivityPub protocol, just like Mastodon or Lemmy. Users can create, browse, edit articles and use many other features. If you want to start a wiki for a TV series, a video game, or an open source project, then Ibis is for you!
MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis.
Alchetron.com is a free social encyclopedia for world where you can create, organize and learn easily using topics.
With Alchetron you can search & share thousands of organized topics which can be biographies, free courses for students etc.
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.
Stubia is a mobile encyclopedia that limits each article to 160 characters: this limitation makes each topic easy to understand.
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MediaWiki is server software that you would need to find a host for/run your own server whereas FANDOM does all the hosting for you and actually runs MediaWiki meaning it isn't really an alternative at all.