Alchetron.com is a free social encyclopedia for world where you can create, organize and learn easily using topics. With Alche ...

Wikipedia is a free, multilingual encyclopedia project supported by the non-profit Wikimedia Foundation. Wikipedia has 17 mill ...

Oppia is a free, open-source learning platform. Full of interactive activities called 'explorations', Oppia helps curious mind ...

Infogalactic is an Internet-based, free-content encyclopedia project that is a dynamic fork of Wikipedia and improves upon the ...

Lunyr is a decentralized crowdsourced encyclopedia and knowledge base, on the Ethereum blockchain. It rewards users with app t ...

The Encyclopædia Britannica is a general English-language encyclopaedia published by Encyclopædia Britannica, Inc., a privatel ...